If you've barely read the article then I can understand why you mistook what and why the comment was trying to talk to in response to the virality portions of said article. It's pretty much an argument "because of court cases, this is how propagation of GPL to the whole LLM model could be forced in the future" and the comment was saying there is actually no case precedence at all about that because it never gets there (usually being something obvious with the copyright portions alone or settlement to release the GPL portions).
Including GPL code in your app requires/results in different things depending on how you do that. E.g. the way Cisco did it with binaries is different than doing it with static linking/ is different than dynamic linking/syscalls/apis is different than expanding the code directly. It's not possible to talk about it as generically as above, especially in context of discussion around an article adding a new method of interaction.
Yes, the point is precisely the article explicitly asks about this point being tested in court rulings and the comment is that it has never needed to go beyond settlement (usually not even that far). I also don't really agree with how the article assumes things around that in a few places, but that's neither here nor their to this point.
It's not that I want proof, it's that the article you admit to not reading sets out to look at court cases to "consider the path through which the theory of license propagation to AI models might be recognized in the future". In that regard it's pretty relevant to note past no court case, nor really the two ongoing in the article, involve propagation of the license to the whole entity yet.