In the team radio when Verstappen's race engineer said that he had to let Perez pass, Verstappen said something like 'we already talked about this before and I'm taking my stand.'... Something like that. Even the race strategist or Horner won't even force the issue. So something really must have happened.
I think these are only rumors and I think that they clarified the behavior between the two drivers themselves.I think that there will be no such scenarios unless Perez deliberately crashes on Max during some race,however I don't see this happening,they have clauses in their contract and I don't think Perez would let himself to be known for a bad person and to leave that memory for himself,if he cannot win the Championship himself I think he will not interfere into Max fight for the title if Max will find himself fighting for the third consecutive title in F1,for me there is a big difference in drivers quality between Max and Checo,I am not talking about the human side of each one,that is a different story.