> They hosted a program that allowed minecraft clients to connect...

Connect in the sense of receiving a login packet and saying "yes". That's it. Steps 1, 2, 3, 9, 10 of [0] (they didn't mention encryption or compression, I'm assuming they didn't implement it.)

They didn't mention anything about any of the steps past 10 - again, assuming they didn't implement them.

It's a trivial thing they've implemented - good work, sure, but a Minecraft server? Absolutely not.

[0] https://minecraft.wiki/w/Java_Edition_protocol/FAQ#What's_th...?