Amazing finds and yeah incredible that a place like that existed pretty much untouched up until now. Place looks like a time capsule of an arcade from around 1990. I'd like to see that TX-1 up and running, that was the first game I encountered down the arcades that blew me away with what arcade games could be, having only really played ZX Spectrum games before seeing that.
And calling Goliaths undesirable! I love my Goliath very much, so many fond memories of playing pretty much all Jamma titles on them back in the day!