He was pretty terrible. So many self-inflicted poor throws that had nothing to do with pressure or the defense.
But upon rewatching the "every pass attempt" and some other highlights (lowlights), it looks to me like he has a shoulder injury. Zero zip on the ball and many times using that strange sidearm delivery.
My i s c & a aggie wife who is an extremely accomplished Physical Therapist watched some of the lowlights with me today and without any prompting just said, "Did they talk about his shoulder injury at all?" And I said, "What? No. Nobody mentioned a shoulder injury." And she said, "He's not throwing overhand. That looks to me like he's either consciously or subconsciously protecting an injured shoulder, like the rotator cuff or labrum."
That would at least explain some of why he threw so many ducks that looked nothing like anything he's done before.