Remembering itself is a conscious experience, so the claim 'consciousness is epiphenomenal' is not disproven by remembering, because remembering may also be epiphonemonal.
There are things you can point to that reasonably disprove the epiphenomenal conception of consciousness, but I wouldn't considering "remembering" to be one of them. I don't think consciousness or remembering ARE epiphenomenal, for the record.