Why should one care if it is a lesbian or gay, as opposed to a straight man or woman who prefers coffee to tea, who writes a great work? In regards to how music qua music is to be evaluated it shouldn't, and doesn't, matter in the least.
In recent weeks the Philadelphia Orchestra has performed several programs around music of Tchaikovsky, while just block away the Academy of Vocal Arts was performing a small scale, but vocally big production of Pique Dame (the Queen of Spades).
Only the English seem incapable of acknowledging the brilliance of one of our own without trying to rummage about in his life for something innocent that can be twisted into an all-consuming fault. In fact, it sounds faintly homophobic, as though we still can't have a national treasure who was gay.