I flagged a GPT answer for moderator attention on June 21st; I don't think I knew about the moderation strike at the time. This answer has since been deleted, but the flag still registers as pending. Can I retract it somehow?
You also cannot retract an active flag for moderator attention if the post has been deleted and you don't have enough rep to see deleted posts.
This answer was posted just over $7$ years ago (on July $7$, $2016$), but I believe its information should still be current. Also, as can be seen in the answer's revisions, that particular sentence was actually added by Sonic the Anonymous Hedgehog in Revision #$9$ on Feb. $26$, $2018$. Nonetheless, I assume Michael accepts this change as it's not been changed or reversed, and also Sonic is the member who seems to have been the most involved in originally creating the set of Meta FAQ posts, and is from what I've seen also the one who does the most to keep them current. Thus, I assume we can trust this sentence even though Michael didn't write it.
However, note that a link in the Allow retracting a moderator flag if the post has been deleted and I don't have enough reputation to see deleted posts post (given in Martin R's comment) is to the Meta SO post Allow retracting flags on deleted posts even if you can't view deleted posts. An answer there by Samuel Liew (a current SO diamond moderator) says