To be honest, I'm not sure. The only way to be 100% sure would be to ask them and it's not easy to ask that in a diplomatic way.

Although it's my own conjecture, it's based on numerous other signals I got from them during the interview process. As an example, any team member A can point out that any other team member B isn't pulling their weight and shouldn't be working there. That initiates a discussion about whether B should be fired.