Yes, screen printing, but there's more to it than those two words!

And the video in the post was sourced and uploaded by...the blog post author.

Also, let's be serious, that blog has been writing about arcade related things for over a decade https://arcadeblogger.com/2013/04/01/1814065/ and running a podcast since 2020, and the author wrote a book in 2020.

One could say he puts real effort into all this, you know?