Not sure what he means with "2000€ share capital", which allegedly is locked.

Typically, you can spend your "Stammkapital" for business purposes (e.g. in a GmbH). It doesn't need to stay in your bank account.

The blog post does not read as written by someone who has understood the whole legal process, maybe that's where your confusion comes from.

The Stammkapital was required for the UG, and it's very much locked since the whole purpose of that is to take liability.

So for a UG it's a Kommanditeinlage. But it doesn't change the fact that you can spend this money for business purposes. You just can't wire it back to yourself or pay it to yourself as a wage. Feel free to buy office furniture or company devices with it.

It's a common misunderstanding that this money needs to be reserved somewhere for liability purposes. That's not correct. You can spend it, both in a GmbH as well as in a UG. Look it up youself (e.g. https://www.anwalt.de/rechtstipps/stammkapital-muss-ich-das-...)

According to the article you linked, it can be used to pay yourself a wage, as long as it's not excessive.