The older question asks about the physical practicalities of giant-human reproduction in general. Its top answer mentions in passing that it was consensual for Hagrid's parents, but doesn't provide any evidence for this other than a single quote. It would be unreasonable to expect the answerer to expand on this argument, since that's not actually what that question is about.
Your question asks specifically about whether Hagrid's parents' relationship was consensual. You provide evidence for why it might not have been, and rebut some potential arguments for why it might have been, including (and this is important) the very quote used as evidence by the answer to the older question. So your question doesn't really "already have an answer there".
From our current consensus on duplication based on answers:
Well, normally the presence of identical answers is a pretty good indication that the questions themselves are the same [...] if you're already pretty sure the questions are duplicates, testing the answers of one against the other can easily confirm your suspicions. But don't close completely irrelevant questions as duplicates of one another simply because there's an animated gif that happens to apply to both.
In this case, the questions themselves are totally separate. And while the relevant part of the existing answer isn't an "animated gif", it isn't exactly an essay either - it's a one-line remark only tangentially relevant to the older question. That doesn't in any way answer your question, which specifically rejects said remark as sufficient evidence, provides plausible reasoning to support the opposite case, and calls for more conclusive evidence. So I've reopened your question. I've also taken the liberty of adding the exact book quote and linking to the previous answer, just to clarify its non-dupe status.