Unfortunately, you misread the post. They are in the unreleased Append DLC, not the update.
So, does this mean that this content is part of a DLC that hasn't been released yet? Is that right?
I found it strange, because I had been playing version 1.3.2 for a long time, so much so that I finished that version, including the extra stages, but I didn't unlock the H-scenes of the extra stages, even though I knew how to unlock them.
When I updated to version 1.3.3, I noticed some implementations that weren't in the previous version, such as Claret's hat, angel wings, and Iris's accessories were available in the clothes.
I also saw that Iris's complete outfit and, if I'm not mistaken, Claret's in subsequent versions.
I can't remember all the things added up to version 1.3.6, which I also played a lot, but I think one of them added the belly and butt shake that weren't available in previous versions.
And apparently, at least I noticed now in 1.3.8, the option to improve the statistics of each piece of clothing and accessory was added.
The game must be about 2 years old now, and it's still fun to play, not just because of the H-scenes, but you can play it like a normal game too.