The fact this was done now, instead of at the end of the term, when we all know this oatmeal brained retard is not calling any shots--should be looked at not because of the thing itself but scrutinized alongside anything which occurs in the following days.
There are cases of pardons being revoked, but both times the pardon hadn't been delivered. Revoking a completed pardon's never been done and there's no way to know how the courts would take it. My money is they'd deny the revocation under double jeopardy.