I'm no expert on MLB service time, but doing some neophyte back of the napkin math on this...
PCA was called up 9/11/2023 and remained on the roster through the end of the season on 10/1, so he accumulated approximately 21 days of service time.
He was called up again on 4/24/2024 and remained on the roster through 5/21, accumulating another 27 days of service time.
He has currently accumulated 48 days out of the required 172 to gain a full year of service, leaving him short 124 days. There are 130 days remaining in the season. Unless I'm missing something in my math, another week in AAA (give or take a few days) would be enough to ensure that he doesn't reach a year of service in 2024. If that is the case, it absolutely makes sense to send him back down to get regular at bats for at least a week or two and then reassess where the roster is at that time.