Every time I've seen that figure mentioned, no one made any attempt to say where it came from. Until I see the figure attributed to a quote from a real human being, it's complete nonsense and doesn't deserve to be repeated.
From that quote you posted:
That has been my assumption from the moment I read that figure with no attempt whatsoever to attribute it.
I agree, that I can be completely WRONG about the 200, and the information is unsourced (As mentioned, Wikis can be an unreliable source of information), and unconfirmed. I.e. potentially completely wrong.
I expect that Sony/Nintendo etc, will remain somewhat quiet about the true facts. So we may find that the exact information, remains secretive/unconfirmed, for a very long time.
If the possible unearthed prototype, is examined by expert(s), opened up (to see the electronics, inside) and photographed/videoed, and switched on (safely). Maybe even run games on it, if possible.
Then a lot of the doubting Thomases, me included, will have to shut up, and accept that it really is genuine.
Given the huge value, if it is real and/or the immense publicity that such a find, is likely to create. A degree of skepticism, and consideration that it might be a fake, is probably wise.
I have little knowledge, about the early PlayStation/Nintendo situation, so I have to mainly read about what others are saying. I either never heard much about it (at the time), or have forgotten about it.