Didn’t watch your video, but I know there are expensive air purifier brands and from what I understand they aren’t really special and aren’t worth paying a lot extra for. You can get hepa at a reasonable price per amount of air flow from costco though FYI. I don’t know how big a deal hepa is, but it doesn’t have to cost a lot extra like some do.
Looks like you got 3100 sq ft per hour for $165 and costco currently has 2420 sq ft per hour for $199 with hepa, so a noticeable price difference but not a huge difference, and it’s actually filter replacement costs that can matter more than initial cost, but I didn’t check those prices. Replacement filters might cost about the same percentage as the new price for both models, but I don’t actually know. Costco has this stuff on sale periodically so you can buy replacement filters when there are sales. Some amazon stuff has sales but not others and the timing can be more variable so idk there.
Noise also matters – if you aren’t running it at max power because its too noisy then you lose a lot of air flow.
Compare with e.g. https://www.iqair.com/products/air-purifiers/healthpro-plus?Model=XE which costs $1200 for 1125 sq ft!