Are there any pictures or video of it running? I understand why they are not on the GitHub page
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But yeah, on a "real" PS1 it would be blockier due to lower res. The main rendering problems should be the same though.
Not if you watch the video on your phone or iPad or laptop!
Actually, even most desktop pc monitors aren't bigger than people's TVs back then.
(Of course, TVs now are bigger than TVs back then. And desktop pc monitors are bigger than desktop pc monitors back then.)
In the end if you reescaled the emulator window down to 320x240 or 640x480 with a 25% scanline filter on LCD's or a 50% in CRT, the result would be pretty close to what teenagers saw in late 90's.