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Grint has won several awards for his outstanding work, like a Satellite Award, Young Artist Award, and Scream Awards.
There is no mention of Harry and Hermione's relationship at all in that quote. But again, it's an excerpt and meant to tease the rest of the interview, which it did effectively.
First, to add some context to the originally published teaser quote, what Rowling started out saying was to address a question Watson asked her about how she (Rowling) relates to Hermione, to which Rowling responded: I know that Hermione is incredibly recognisable to a lot of readers and yet you don't see a lot of Hermiones in film or on TV except to be laughed at.
I mean that the intense, clever, in some ways not terribly self-aware, girl is rarely the heroine and I really wanted her to be the heroine. I think that is how I might have appeared to people when I was younger, but that is not really how I was inside.
Then she goes on to talk about how Ron and Hermione's relationship was a form of wish fulfillment and probably more for personal reasons than literature or "reasons of credibility." From there, she goes on to say that it was a "young relationship" and while the attraction between Ron and Hermione was plausible, the combative side of it might not have worked in an adult relationship.
"There was too much fundamental incompatibility," she explained.
And, there are no public claims about that relationship.