Let he who is without sin cast the first stone
Look, we've been over this several times. HIs are generalists. Yes, some are rather weak on their knowledge and yes, some miss things or mistakenly call out things that are not a problem. What you are missing is how often they DO find problems and call them out. I'd like to follow you guys on a home inspection then have a licensed HI follow you so we can see how you do.
Yes, this guy got some weird advise somewhere. Obviously, a lot of HVAC techs do too because of all the things brought out here on this site not limited to the Wall of Shame either. I am constantly shocked by how many techs not only don't know the current codes but don't own a copy or have a clue about their content.
I do know that most HIs attend annual training to maintain CEUs for their license----do you?
DavidR regularly monitors a similar discussion forum of theirs so he can tell you how full of crap they are or how sharp some of them are.