They are (most of them anyway, there might be exceptions, like players who signed the summer after we had failed to qualify, and thus had no part in it, like Casemiro), but Sancho signed when we had qualified for the CL the season before. I'm not sure if the CL qualification counts as a bonus here. I think it's reasonable to assume he got basic wage of £250k + (other) bonuses, and that he'd get a 25% reduction on that basic wage if we didn't qualify for the CL (which we didn't in his first season).
The £350k number just seems inflated compared to our other players. But it was on Woody's watch so who knows.