Yes but@StegosaurusRex, am concerned that it was out of desperationie numbers are way down.
But the university and course are still the same as they were when your DS looked at them and decided that he liked both enough to apply? Is he applying with way below the usual offer as his predicted grades? I suppose a quick offer, in those circumstances (especially if at the level predicted), might lead one to wonder whether there was something desperately the matter with the place. But if his predicted grades at at / above / only slightly off the usual offer, then I don't see the issue with having had an offer so quickly after applying. He can always decide not to use Winchester as either his firm or his insurance, if he is uncomfortable with the offer, or changes his mind about the course / university once he's been and had another look
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There's no rush, anyway, since he's got until early May at the earliest to decide.