Based upon a quick look alone, or some actual experience related to plastics design and materials specs?
I ask because I have a fair bit of experience designing & testing parts made from plastic inject molding, with a range of materials and I see no major points of concern here from the pics & vids. The loading is relatively restrained (lots of compression loading in particular) and there is plenty of ribbing within the various sections of the parts from what I see. Couple that with the lack of knowing the precise material in use, and I’d say it’s a fairly wild guess to cast doubt on these parts without more specific info to review.