Like the previous commenter points out, actual lawyers are quite clear that their statements in this kind of non-professional capacity hold no more weight than any other random Joe. There is no situation of authority. IANAL/IAAL may have once been a funny meme – albeit one quite tired at this point – but doesn't add anything, and may be a detractor if one falls prey to the logically fallacy it potentially introduces.
As before, it used to be a funny meme – albeit one that has become tired – but there is no significance to it. Who the person is tells absolutely nothing about the rest of the comment.
This is not at all what "I'm not your lawyer" means—that's a disclaimer to say that they're not taking legal liability for their advice to you because you're not paying them. They're still far more qualified than I am to talk about law in the abstract and dismissing that as "appeal to authority" is a false appeal to egalitarianism.
While they have the capacity to be more qualified to talk about the law, that does not imply that they will choose to exercise those qualifications. Lawyers can be trolls just like everyone else.
The work must stand on its own. If it is of high quality, then it is of high quality. It does not matter who wrote it. If an infinite number of monkeys wrote it, it is still of equal value.
The person is irrelevant.