But yeah, if you live on full time minimum wage here that's ~1200€ per month, of which probably 500-800 depending on where you live will go to rent. And if it's 800, it would probably be 1800 if everyone got 1000€ per month. So in that sense, he might be right.
On the other hand some people just might actually quit their job with 1000€ per month and live somewhere further away from cities, since they don't have to live there to work. And maybe that would incentivize employers to try to create more work outside cities. Seems almost impossible to really predict the large scale effects here.