No, this has nothing to do with the 2018-model dimming issues, they have some sort of delay for luminance when doing the tone mapping. What you have is sort of a broken implementation of the auto-dimming feature in the 2017 models. It has nothing to do with the Vero and can also be seen on Netflix etc. (it’s especially noticable on HDR content).
Basically, the auto-dimming is supposed to dim the screen when you have static content. The way the feature is implemented though is that it doesn’t actually check if the image is static but if a certain contrast threshold value over the entire frame has not changed in a while. So if you watch very dark scenes that go on for several minutes, the TV will think “it’s a static image, better turn auto-dimming on”.
The only way to disable this auto-dimming is through the service menu, I did and it fixed this issue for me with no other problems. You can access the service-menu with a Logitech Harmony remote or an IR-blaster app for your phone. It’s the “In-Start” service menu (code is 0413), go to menu 13, turn “TPC” off, and then just exit the menu.