Make no mistake, God will judge, not me, not you. But the visible evidence to my eye is that he did not die in grace.
That said, while I did not personally like his music, not to my taste, he was a very talented musician.
The verse wasn’t meant to accuse or excuse Bowie, but to answer the virtuous pagan question. I have no idea about Bowie’s spiritual condition and, no, I would not consider him a virtuous pagan.