In theory, or by a lone nut or two, maybe--I would say that, apart from Cole (who since recanted), David Icke is also technically a holocaust denier but not an antisemite--in his case, his holocaust denial stems from the fact that he thinks all accepted history is a lie engineered by shape-shifting seven-foot-tall alien lizards (I'm not making this up, honest!). There are, I presume, other cases where holocaust denial is more an expression of paranoia and mental illness than of hatered of jews as such. Icke might as well claim slavery, or ancient Egypt, never existed.
But apart from such isolated examples, 99.9% of holocaust deniers are obviously and blatantly antisemitic (oops, I mean, "anti-zionists", wink wink, nudge nudge) and almost invariably pro-Nazi. The point of holocaust denial is to make Nazism respectable again.