I came to the conclusion that this guy doesnt do it out of hate for FFVII remake/rebirth, but out of love and fanboyism for FFVII.
Yep, that's right. He loves it so, so much that Chocobo sage couldnt be just an old guy you found that forgets things, has the chocobo music playing on his house and is the key to chocobo gold. No, he HAS to be an "enigmatic creature" and "omg im so intrigued...he could be...half black mage!?, omg this game is so...deep and complex"

They turned the chocobo sage from a random NPC that forgets things in a goofy way into a "crazy but wise old man" trope from 90's animes, that you are not even sure he's the real chocobo sage and not just some old dude impersonating him. He's a little more complex, still the same idea.