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I actually think he was saying "go ask Billy Corgan" about Mellon Collie because it marks the last time a band actually did it right.
Corgan himself has gone on record saying nice things about Oasis a few times. In the mid-90's they'd take jabs at Oasis, but afterwards he came back around and said they were amazing etc. I am sure there is mutual respect there.
I don't know, it sort of clashes with what he says about double albums directly afterwards. "No one has the time for double albums in 2013, so go ask Billy Corgan about how to make a massive one". I could be wrong, though. I just assume Gallagher's snarky every time he opens his mouth.