I am asserting that in conversation about market collusion it is relevant whether such implicit coordination leads to different price level that would be withou

I am asserting that in conversation about market collusion it is relevant whether such implicit coordination leads to different price level that would be without such coordination. If you have fixed supply, then price as high as possible as demand allows is equilibrium reached even without any coordination / collusion by suppliers, and it is just a question how fast market converges to such equilibrium. Whether there should be social or political reasons for regulating rents is completely different conversation.