It is hard to tell without trying but it seems like just a screen sharing like app built on chromium. Lacking in detailed technical specifications or any organizational backing, its credibility is very questionable. Just a guy bragging about how he spent a year alone and wrote gazillion lines of code, which makes no sense as a metric.
Exactly my thoughts as well. This just seems like a 20 year old with too much time on his hands bragging about creating something a lot more trivial than he makes it sound.
Also, I can't fathom who would want to use a "multiplayer browser."