IANAL, and TINLA: Lawyers are well positioned to know exactly how much trouble they can get into by casually giving someone legal advice for free, and how much trouble someone who isn't a lawyer can get into for the same reason.
Which may mean that those who are in other regulated professions such as CPAs or MDs should be doing the same...
Noting of course that "grellas" has no such disclaimer though.
Would think there potentially might even be exposure for someone who does put disclaimers but then doesn't in all circumstances (in other words reverse default of typical behavior).
For example if you have an amusement ride and you put a sign in front of 20 rides "be careful dangerous ride" but don't put the same sign in 10 other rides doesn't that imply those rides aren't dangerous by one way of thinking?
Noting also that the particular HN commenter doesn't put a disclaimer on his twitter account.
I think- not 100% sure because I can't recall any case law- but if you are referring to Grellas' website, it would qualify as 'general information' and not 'legal advice' because it is not an answer to someone's specific question on a legal issue.
For example, Grellas has info on the best practices for company entity formation, financing, etc. It would be different if Grellas was at a party and he answered a question of "oh your a lawyer... I'm trying to convince my brother-in-law the engineer to work on this medical prototype idea I have on nights and weekends. Is a C-corp, or an LLC the best way to go for tax purposes?"
Which may mean that those who are in other regulated professions such as CPAs or MDs should be doing the same...