Yeah, this makes no sense. Most of the phones that I've owned were Samsung galaxy phones partly because of how quick and how long Samsumg supported their phones with operating system and security patch updates.
The Fold 4 is Samsung's most recent and most expensive flagship phone. Here we are in the month of October and still sitting on a July security patch?!
I hope this isn't indicative of what their security patch and operating system updates are going to be like going forward on this phone. This is on par with or worse than Motorola which is known for slow updates (I owned their expensive flagship Motorola razr 5g at one point and the pace of security patch updates on that phone was absurd -it was supposed to be every other month but was sometimes once a quarter and, when the security patch finally arrived, it wasn't even the most recent month).
I don't recall this long of a delay getting security patch updates on any other Samsung phone I've ever owned. Not a good first impression, Samsung.