I can't find anything other than this fake news article on the subject. I guess the "politically correct" thought police prevent anyone from speaking the truth. Look what they did to the Flyers' coach.
https://www.inquirer.com/flyers/flyers-alain-vigneault-black-lives-matter-20200829.html BLM has nothing to do with hockey. It's just brats like Lebron James who are not content with destroying the NBA but spread their hatred to other leagues. The NHL doesn't have ads for BLM on their scoreboards in the arena. It just says black lives without matter, since the organization using that name is a hate group (not their words).