I just had this same argument not long ago over in the Damian thread about the GlassTT run and like I said there YES WE ARE.
Damian did stop Wally West's heart. That is something Damian would do.
Writers have changed Damian's motivations in TT but he did strap a bomb to himself That moment was OCC and deeply racist but like lois lane in blackface that moment still happened
Just because you don't like it doesn't mean it's not canon.