Mickey those figures are winrates. .87 means +.87 units.

The table for wilds shows RTP.

I personally think his numbers look very believable. For OM I was less sure but OM is unintuitive because you're really playing either (1) with a bubble in the third column, or (2) betting with modest subsidy from the other columns while hoping to get a third column bubble. In other words if I'm not mistaken almost all of the non-3rd column plays would not be plays if you knew that no bubble was going to come on the third column.