They are going to be more or less sterile the first time you use them, but what about after that? The trouble with FFF prints is that there's a lot of surface irregularity that makes them nearly impossible to clean, and if you heat them back up to sterilization temperatures, all you've got is a puddle of plastic.

As for the Purement antibacterial filament, something that kills 99% of bacteria (even if it works) selects for the 1% that's immune. Just like with antibacterial soaps, I'm not sure that's really such a good idea.