No he doesn't. You can register a Kleingewerbe at the Gewerbeamt online ([1] for NRW) and start right away. You can create an UG (literally supposed to fill the gap between a GmbH and a Kleingewerbe) within 2 weeks depending on the notary. And those 2 weeks come from the fact that the notary has better stuff to do than a UG registration and therefore probably doesn't make time specifically for you.

If you want to start a business and you don't need to pay for an office or whatever (because you can actually use those 25k for something), you can literally start over night. If you need a proper company that limits your liability, you can literally start in 2 weeks.

[1] https://service.wirtschaft.nrw/unternehmensgruendung/gewerbe...