The inclusion of families with only a single parent present in the list of heterosexual moments was addressed as one of the very first things in that post, and the OP agreed that she would adapt her final list to exclude the not explicitly heterosexual families. And I think the Vampires of Venice thing was less equaling rape/torture and heterosexuality, it was more that an alien species was presented as having a heterosexual norm. There are other versions of family structure they could have used--two same-sex partners, three partners, more than two main genders, etc etc. But they went with using the standard male/female structure, which is why, I think, this item ended up on the list.

I think it ignores a lot of subtext
Well, of course it does. It's a post about the textual references, not the subtextual. Which have decreased by a huge amount. There were groves of subtext in RTD's era--take the Doctor/Master relationship, for example--but there were also a long list of queer textual references. Queer subtext is completely useless when it comes to queer representation, because you only see it if you're already on the look-out for queer relationships. I would bet money on any casual viewer, especially kids, not having seen a shred of homoerotic tension between Vincent and the Doctor.

I mean, Star Trek: TOS had bucketloads of subtext. Doesn't mean they had anything resembling equal queer representation.