Nobody is saying that. However, it is entirely valid to point out that gay characters, especially those who actually engage in same sex activity on screen, have a disproportionate tendency to die, and it's not only disappointing that a show which touted its diversity as a selling point went to that well, it's really regrettable that the producers openly admit knowing about that trope and its impact but doing it anyway, saying it was ok because they "didn't mean it that way". That's pretty short sighted, especially for a gay writer.
Star Trek had its first gay couple and they were natural, believable, and brilliant. And then they killed it off before season 1 was even over. However much you hate criticism of the show, that's a valid point to make.
A sci-fi resurrection/reset button may well be in Culber's future but that doesn't change that this episode contained the brutal murder of yet another gay character on TV, and adds the element that Discovery isn't sticking to another of its selling points, 'anyone can die'.