Well the copyright notice says 2017 Jun Amanai, name of the guy who made the videos... I'm willing to believe that the site is real and his.
I thought that Jun only uploaded videos with little to no info on them because releasing a ROM would be a shameful dispray but apparently everyone has a price. Our community isn't one to go gaga over a proto of anything to do a "fundraiser" (which is actually a good thing) so this will probably go back into the dark hole of japanese collectardism to stay alongside PC Cocoron and others, unless some Frank Cifaldi type character comes across it and buys them for public ROM dumping.
Who cares about those arcade ports when we have roms for Taisen PRO Mahjong and The Super Kung-Fu to play in our supergrafx consoles anywyay.