Not sure it's embarrassment per se. Gunnar just ended up much better than anyone thought he could be. It happens. There were swing concerns if I recall.
He only threw 11 pitches, so he could, but I bet they don't. He won't pitch tomorrow but they may be worried about him being able to go Wednesday if he gets too high.
This is why you have to take the TV strikezone with a grain of salt. Rizzo's K was a strike according to statcast, which is what the auto strikezone is based off of in AAA.