Why not?
Besides, that doesn't prevent people from agreeing with Marley's messages, regardless of any religious background.
But when those messages are completely overtaken by weed jokes, dreadlocks and nostalgia over reality cop shows and Michael Bay movies...?
Yeah, this is not blackface. Blackface is caking on paint and exaggerating skin tones / features / behaviors. This is totally fine imo. If you can't see the diff between this and the idiot in South Carolina (or wherever) who paints herself with black face paint and puts on a fake gold chain and posts it all over the internet then idk. There is a stark difference. These face swaps don't affect any one race more than another; I had one that gave me a DiCaprio face, that's what they do... doesn't mean it was saying "oh look now you can be white!" No... it's saying you can have this celebrity's face as a mask.
Edit: This is way more akin to buying a prefab mask from a party store for Halloween. If you wear an Obama mask or a Mr T Mask, does that count as blackface by itself? Of course not.
Halloween costumes are not exactly a good example of "safe" (lol) uses of appropriating other races/cultures...