So this article about the Dubai tournament does not cite boycott as the primary reason for Peer's visa denial, but one of several reasons. It seems that the main concern was security--as in fear of violence. Not the same thing as a boycott. If no one shows up, there wouldn't be much need for security, eh?
Attention though has now been turned to the pending Andy Ram situation with the ATP already stepping in asking the UAE do "do the right thing."