There is NO specification in the ePub standard for cover (at least in 2.1), so whatever ADE does, it's not against the spec.
The <meta> tags are all out-of-spec (allowed, but without any particular meaning, whatever their "name" and "content"). Some software might interpret them some way, but others might ignore them, and they wouldn't be doing anything wrong.
That said, your <meta name="cover" content="coverimage" /> tag is recognized by many readers and programs, but I believe not by ADE.
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