This kind of guilt-by-association play might be the most common fallacy in internet discourse. None of us are allowed to express outrage at the bulk export of GitHub repos with zero regard for their copyleft status because some members of the software engineering community are large-scale pirates? How is that a reasonable argument to make?
The most obvious problem with this is it's a faulty generalization. Many of us aren't building large-scale piracy sites of any sort. Many of us aren't bulk downloading media of any kind. The author has no clue whether the individual humans making the IP argument against AI are engaged in piracy, so this is an extremely weak way to reject that line of argument.
The second huge problem with this argument is that it assumes that support for IP rights is a blanket yes/no question, which it's obviously not. I can believe fervently that SciHub is a public good and Elsevier is evil and at the same time believe that copyleft licenses placed by a collective of developers on their work should be respected and GitHub was evil to steal their code. Indeed, these two ideas will probably occur together more often than not because they're both founded in the idea that IP law should be used to protect individuals from corporations rather than the other way around.
The author has some valid points, but dismissing this entire class of arguments so flippantly is intellectually lazy.
I don't think that is an accurate representation of the tech community. On the other hand, I do think TFA is making a reasonable statistical representation of the tech community (rather than a "guilt-by-association" play) which could be rephrased as:
The overriding ethos in HN and tech communities has clearly been on the "information wants to be free" side. See: the widespread support of open source and, as your comment itself mentions, copyleft. Copyleft, in particular, is famously based on a subversion of intellectual property (cf "judo throw") to achieve an "information wants to be free" philosophy.
Unsurprisingly, this has also manifested countless times as condoning media piracy. Even today a very common sentiment is, "oh there are too many streaming services, where's my pirate hat yarrrr!"
Conversely, comments opposing media piracy are a vanishingly tiny, often downvoted, minority. As such, statistically speaking, TFA's evaluation of our communities seems to be spot on.
And, now the same communities are in an uproar when their information "wants to be free". The irony is definitely rich.
And for that reason, I think your version exposes the flaw even more thoroughly: you can't reasonably merge a data set of stats on people's opinions on AI with a data set of stats on people's opinions on IP in the way that you're proposing.
To throw out random numbers as an example of the flaw: If 55% of people on HN believe that IP protection for media should not exist and 55% believe that GitHub stole code, it's entirely possible that TFA's condemnation only applies to 10% of the total HN population that holds the supposedly conflicting belief even though HN "statistically" believes both things.
And that's before we get into the question of whether there's actually a conflict (there's not) and the question of whether anyone is accurately measuring the sentiment of the median HN user by dropping into various threads populated by what are often totally disjoint sets of users.