The author remixed this model.
When I printed the model at first the hole came out too tight for filament to fit. The pin holes I see in the AM4/LGA15xx variants import as 1.55 mm. Since the listing says 1.75 rod, this could be an issue with the STEP files being out of date but that's what the diameter was when I imported it into OnShape.
I increased the size to 2.1 mm to account for tolerance and added a notch to ensure the hole came out mostly round. The result is an AM4 CPU holder that fits a piece of filament well enough to use as a hinge.