I disagree with the statement that autopark is part of FSD. That has not been my experience on my 2023 MS LR (Vision only, no USS or radar).
I first received autopark as part of 2024.2.13 on March 26. At that time I did not have an active FSD subscription. I did purchase EAP with my car, and autopark was a part of the feature set of EAP, not FSD.
I did receive a few days later on Mar 30, 2024.3.16 which was my first FSD v12.3.2.1 release which started my 30 day FSD free trial, but already had autopark capability prior to that.
I did just a week ago go ahead and decide to purchase FSD. For me this was just a $2,000 added cost given the price drop to reflect having already paid $6K for EAP (I purchased EAP with my car to have similar highway capabilities which my AP1 vintage 2016 MS 90D).