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The values seem plausible when you consider the sensors were recording non-stop for a whole week. 1 vehicle hit 90+, 3 hit 80+. Sometimes you'll see motorbikes at these kind of speeds on less-open roads than the outer circle.
I don't care to dispute or validate the figures, but they are a part of the consultation for the changes in RP for CS11. I'd imagine there would be all kinds of legal issues for TfL/DfT if they were relying on inaccurate speed surveys and/or crap equipment to justify their road plans.
As @NurseHolliday said - not sure if serious.
Look at the maximum speed recorded column and tell me this table is anything other than complete bollocks. The machine's obviously getting confused and any figure that comes out of it should be ignored.