Knowing and knowing of aren't the same thing.
You may be right. In trying to sound dismissive, Wacker sounded to me -- and to other people -- like he really didn't know who this pesky Erik Larsen fellow was. That either makes him woefully ignorant for a Marvel Comics editor or just snotty for pretending.
Either way, I'm confident that Erik Larsen will be remembered as an actual creator and a successful company co-founder long after Wacker has returned to ... I dunno ... proof-reading greeting cards or marketing dog food, or wherever Marvel and DC get these junior editors from.