I can imagine that the subject of play in animals is controversial among biologists and ethologists. How dare animals have fun in adulthood. Humans have way less fun as we become adults. Therefore given we are at the top of the life chain, especially of intelligence, it makes sense that this is an issue - squirrels should not be playing. Especially now in early spring out front in the garden.
Scientifically in the past, play in adult animals was considered a functionless behaviour unworthy of study.
“Behavioural fat” as Dietland Müller-Schwarze and colleagues described it in their study on play behaviour in deer fawns...the old mantra that animals never play for the sake of it, that there’s always an underlying biological imperative at work, is increasingly difficult to reconcile the more we observe other species, including squirrels."
They delve into possible reasons HERE with video footage. One reason given is a parasite that causes itching (yuk!) - so explains the jumping and wiggling. Most of these articles are anywhere from 5 to 10 years old.
I recently heard a CBC interview where play was clearly observed in various animals and now being acknowledged.
What about how World Guinness Records views squirrels? Here's a non-Guinness record: it could only be from the US - Mountain Musings:
"Garth T. McGillicuddy and Henry A. (Bubba) Jablonski were deer hunting on Maryland's Eastern Shore on Bubba's farm last Thursday when they were attacked by "the biggest dang squirrel I ever seen in my life" according to Mr. McGillicuddy. The animal has been identified by a biologist from the MD Department of Natural Resources as a Delmarva Colossus Squirrel. These large tree dwellers had not been seen in over a hundred years and were presumed to be extinct. The biologist also stated that the hunters were lucky to be carrying deer rifles as these squirrels had been known to attack humans and carry off dogs and small children. As this is the only known specimen of the Delmarva Colossus Squirrel, it is likely that the world record trophy will never be broken. When asked what he planned to do with the animal, Mr. Jablonski replied "That baby's going on the wall. I don't know of nobody who's got a giant squirrel on the wall." He further stated that he might be willing to loan it to the Bass Pro Shops or Cabelas outdoor stores for a touring show "if they throw in a bass boat." | 
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