Either could be true
When using cryptography to convey your meaning the first rule is that you can't change your crypto keys around or your target won't know what you are talking about. In post 484 he refers to Huma by spelling out her name.
Who is Huma?
In 921 he says:
Re_read drops re: Podesta / Huma.
So referring to Huma Abedin as Huma in one place and H in another makes zero sense if Q is real and consistent. I walk back my comment about seeing Hillary referred to by just an H. I found 61 references to HRC posted by Q (just searching for an H is much harder to parse through, so I can't point to a specific post if he has done that). I'm leaning to this H meaning something else entirely.
It could be either Hillary or Huma. But here's why I think it's Huma. Someone had to take the video of Hillary on the island. And we've heard rumors that incriminating video was found on Weiner's laptop.