Still not as bad as the Rosalina theory where he flat out shows dialogue and cutscenes that debunk his own theory as he's talking about it.
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Apparently the Cipher DLC for Echoes is out today, I can't seem to get it yet though.
Matpat's Rosalina theory isn't that bad by comparison
"Ness turned into a skeleton person by going through a thing that destroys all organic matter, as bones aren't organic anymore"
"The Morph Ball is worthless, even though I won't address the improved mobility and bombs"
"Pheonix Wright hid glass and the Maya note in his pocket, which is why Gumshoe found them on the floor untouched at the scene of the crime"
"Chun Li's size differs from game to game. However, because it's convenient for me I'll pretend she only has one specific size"
"There's no Peach toy in the Mario VS DK series" *shows a Peach toy during that sentence*
"I'm going to deduct whether Inklings evolved from humans or squids by ignoring the lore saying squids and just compare the species"
"Harry Potter ISN'T the chosen one! My original theory that TOTALLY isn't canon in the books"
"Zootopia's Nighthowlers are crack"
"Metroid Fusion has a sentence that says the animal friends aren't infected by the X Parasite, I don't believe them!"
"Luigi hates Mario because he was brainwashed in Super Paper Mario, but hypnosis, something different, can only be done willingly!"
"The internet is mean to me, they even made a petition to get me off of the internet!" *shows a petition that only wants Matpat to admit his Mario is Mental video is false*