Had the same thought from the headline, but the punchline is that he's using the VPN he completely built himself and can't even trust that one.

He most likely wouldn't have this problem if he used a VPN product for clueless users. It has nothing to do with trust towards a class of technology and all to do with the fact that computers are hard.

... which is entirely a PEBCAC-type error in this case, as he never tested if his configuration worked as expected.

Which is not surprising because according to him, all it takes is running a simple bash script