My puerility aside, I have the hole and the sub. Jan 2018 build. I'm also convinced a nontrivial amount of road noise comes in through there but I've been too lazy to put a chunk of dynamat over it to see for sure.
I have a subwoofer, and I have that cutout, but there's padding/insulation or something covering it up. So I chose "no hole" since you can't see any resemblance of light coming through it like in the screenshot posted by the OP.
Starting June/July 2019 the hole disappeared. My build is July 2019, no hole. Unscientifically, there seems to be less road noise coming from the rear trunk space but also less bass from the woofers. Noticeable difference when seats are folded down vs. up.
All cars have something similar. It is used for air flow so you can get fresh air into and out of the cabin along with shutting the doors. They redesigned the air flow about 6 months ago. It has nothing to do with the subwoofer.