Dobson's stance is more like a crotchety old man who can't adapt AT ALL. It's not that he thinks those cartoons are canon, it's that they were all the expanded lore was at one point, and then around the time video games turned 3D Nintendo flipped his entire world upside down on a Z axis. It's like the whole "planet mobius/Robotnik" thing, but even more sad and hilarious because even less people ever cared in the first place. "But you said Mario was from Brooklyn! Now he's not!" You saw this in a non-Dobson level when Mario Oddysey's release came around the time Nintendo came out and Nintendo's stance was "Mario's a mid-20s guy who isn't a plumber" and the whole internet went "WTF THAT MAKES SENSE NINTENDO WHY YOU CHANGE"
As time marches on, his misplaced anger at this only gets more bizarre to a person, and Dobson can't articulate himself to save his own life. If he were older, he'd be making PHONE BAD comics-- though he may still do so, as it's obvious anything from the 90s or later is just alien to him.