Can you really accuse a person of being homophobic though when the factors that have led them there are cultural and religious beliefs from where they grew up?
It's probably a dangerous can of worms to open because most people who are homophobic, sexist, racist, etc. can probably point to environmental factors beyond their control rather than it being a case that they're fundamentally bad or intolerant people.
Should Sarr and Gueye know better? Probably. They've spent most of their adult lives in European countries where they'll have been exposed to open-minded societies to act as a counter to the cultural and religious influences of their youth. I'm just always conscious that it's easy for me to point at homophobes and racists from other cultures when I've grown up in a liberal democracy with normal parents. Yes you should be able to think for yourself by the time you reach adulthood but it also might not be easy to, for example, go onto a football pitch wearing rainbow laces if you know your parents, uncles and aunties back home would be ashamed of you for it.
Probably playing a bit of devil's advocate. To be clear, I'm very much not homophobic and people are entitled to feel as strongly as they want about their football club making decisions like this one.