Digging up the manual and promotional material showed a few things. They regularly refer to it as USB-C by name, and the manual lists the models as OBELIEVE OBL-0901500E / OBL-0901500B. I can’t find much on these, but they are manufactured by DongGuan, suggesting an off-the-shelf part.

IOW, the damage is unlikely to be from plugging in a standards-compliant USB-C PD adapter.