It's pretty well known that
Amazon is full of fakes for just about anything. Plus, if you watched this guy, he's far from being an influencer or personality. He's an aerosol engineer who put his skills to use early in the pandemic during a lot of free time.
Now that's not to say that you can't get a legit product. There are many shops set up through Amazon and those are probably fine, but when you just see generic masks coming from China and touting that they are FDA compliant, etc., there's really no way to know and many have been proven to be fake. Also reading many reviews within the masks show that people are finding fakes.