A Scite4AHK theme can have any combination of colors you like.
There are a number of dark themes available of which only some are included with the original installation. I know, I had at least 5 different dark ones over the years. Of course, you could also edit them yourself - so it's possible that this is a customized one. I have changed one or two things myself in my current one.
There is for example this topic with a couple of themes, and some information how to edit...
viewtopic.php?f=61&t=69