People were able to buy stuff in communist countries like GDR and other soviet republics (well, shortages of goods aside of course lol). So those were capitalist in a way then?

Stalin et all. turning in their grave intensifies

Jokes aside:

Key points defining capitalism are the pursuit of profit and that the means of production are in private hands. Buying stuff is a “feature” of many systems besides capitalistic ones.

Edit: fixed autocowrecktion