Doubts about carbon fork condition
I think what you have is a lower end carbon fork where cost has been saved on the finish.

Carbon fiber composite is made from carbon fiber cloth in an epoxy matrix. The cloth weave often shows through the finish of CFC products. The finish in this fork seems to be somewhat variable. I think you are right that the lines on the inside are mold junction lines. Notice that are all on the inside surface to try to hide them.

What I would be more concerned about are the two vertical crack lines visible in the first photo, running parallel to the mould line above the cable exit. They may just be in the finish but I would have a bike repair shop check them out.