I am not sure about that. I would take some bets, that since George Floyds death (and before ofcourse too), some white people over the world (probably and especially in US) have experienced some racism by black people too. Like some stereotypes that most white's are racist etc. And in this context i could believe that some people would like to send a message that 'whie lifes matter too'.
I obviously don't know which intention this banner from Burnley had, though. But i think it's difficult to instantly brand it as racism. I don't like it. We should aim for equality and not for something else, or it will always be a seedling for new hate in future generations.
Here's the guy who organised it..
Is the intention starting to become clearer?