This isn’t something that I’ve ever seen before. I was just sitting on my PS4 when a System Software Update called “5.53-01” popped up in my download list. It only weighs in at 69mb and thankfully didn’t require my PlayStation 4 to restart, but it did say that some games would require the update to play online.
I’ve personally never seen a software update with a hyphen which would indicate that this is another version of the same system software update with a minor update. Usually it’d just go up .01 or jump a little bit further.
The update suggest that it does the below, but there must have been something that PlayStation wanted to patch out urgently.