No, I don't think that there is any admission that VP8 is covered by these patents, just that if so, there is a license to use it regardless.
Also, what makes you say that the license is GPL incompatible? As far as I know, the only requirement of the GPL is that if you have a patent license, you must grant the same rights to people downstream, and it sounds like this license does that. Do you have details of the agreement that indicates that it's not GPL compatible?
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