Ok, so what's your actual argument? Preferably phrase your objection with references to the text behind the link you criticised.
And don't worry, I'm just popping by. Haven't been regularly using Zig Forums in over a year now. I've just bookmarked this thread, and will be responding to intellectualy honest responses.
I'm not familiar with Heinrich himself, but my position is roughly in the same category, be it with a few important differences.
Marx was not a philosopher (but a critic of philosophy, in the same way as he was a critic of religion, the political economy, and other human activities which self-enstrange people from each- and one-another, to mystify real social relations, etc.), so theories of value weren't used to "justify" some philosophy. This doesn't mean that he argues that labour time is uncorrelated to value - quite the contrary, as everyone knows. Value is the mean by which social labour is coordinated, which is a characteristical feature of societies within which the capitalist/bourgeois mode of production dominates.
…And sure, the labour theory of value, can be falsified or proved from an economic standpoint, and one can play around with it, however much one likes, this doesn't contradict anything I said.
Not in my experience… From what I know, it has more to do with the interpretation which I have outlined above. What is the point of "abolishing" capitalism if you just rebuild it in a different form? From my understanding, and I am willing to debate this, Marx has a far more substantial conception of overcoming "Capitalism". Dismissing the critique of "Marx as an economist" would be a real loss, I belive. And from all the theories and interpretations I have seen, the one I have just outlined seems the most reasonable and valuable, for actually understanding our day to day lives – which doesn't mean that I have no interest in understanding what is supposed to be wrong about it.
Please tell me where I implied anything along these lines. If anything, my dismissal of the LVT as a transhistorical law would speak of the opposite.
It's really nothing special, nor is it particularly hard to understand, if anything it's only a bit dense.
The message is basically that what we experimence in one day to day life, which goes beyond strictly material and biological categories (such as food, the need to sleep, the pleasure of having fun with friends, …) has historical roots, causes and influences, because of which it isn't universal throughout time (like wage-labour, religion, particular forms of consumption and "free time"). All of these things have in some background in the dominant mode of production (in our case a capitalist one), based on it's limits, potentials and needs (for example, in our case the question of profitability). Then again, these "material conditions" also change, because of the human/societal responses (see redtexts.org/html/perlman_1969_reproduction_daily_life.html), which makes them "ever changing". Really nothing extraordinary or enlightening, unless you phrase it like some Oriental mysticism about "everything is connected", "transformation of quality into quantity", "unity of opposites", etc. This "dialects", especially the what Engels coined the "Laws of Dialectics", can and should be dismissed (see redtexts.org/html/sauvage_2016_marxs_dialectical_method.html, as I've already linked above).
"Static abstractions floating throughout the void" is basically just idealism, as Marxists like to use the term, implying the opposite. Non changing universals, beyond human control or influence.
And by the way, this isn't necessarily connected to "dialectical materialism" or "historical materialism". All I have explained until now just presume a materialist (in the sociological sense) or "naturalist" understanding of history – something most people already do on some level to begin with! (see redtexts.org/html/smith_1999_marx_vs_historical_materialism.html for more details) There's no reason to mystify Marx, unless that is you want to prevent common people from understanding him. I just don't see a good reason to do this.