No, that's different. The museum is an actual gameplay element.
Yeah, and when WD was Sega-exclusive, they were showing off WD's stuff in that space. Makes sense.
That's purely speculation.
Yeah, he released Alundra... after Bernie Stolar left Sony. Key point, that. And also, you're confusing things; Vic said that Bernie's Sony didn't want him to release Arc the Lad because it was an RPG. I don't think he said that it was because it was also 2d. His complaints about Sony blocking 2d releases were mostly about Grownlanser Generations, the PS2 games he was forced to put in a collection. Don't mix that up with the PS1 stuff. PS1 Sony also was biased against 2d, but seems to have been slightly more forgiving than they became during the PS2 era.
No conjecture involved, except in your head.
That percent is an invented fiction. I've already brought hard evidence, you have none. If you ACTUALLY believe that we got 70% of the 2d games on the Playstation, well, we're done here. You clearly don't have the slightest idea of how many 2d games released in Japan, as Barone said.

What you're missing is that there are vastly, vastly more 2d games released on the PS1 than that in Japan. With puzzle games for instance, here are some actual lists.
US released puzzle games on PS1:
http://www.gamefaqs.com/ps/list-173?region=1&dist=1
Japan-released puzzle games on PS1:
http://www.gamefaqs.com/ps/list-173?region=2&dist=1
Some games of course are in the wrong genre or actually did get a US release, but still, the Japan list is at least four times longer than the US one, as you'd expect.