Or watch thsi video on teh Optoma UHZ65.
Ahh yes... "TVS Pro" Ive come across many of their "reviews" before.
Much like your 'guy from Optoma' or your own scepticism of a 'paid' review Ive never really trusted a retailer who sells and heavily pushes Optoma. They also in fact sells their own rebadged 'Theo' Optoma products.
My own scepticism really doubles down with such retailers that insist on calling these products 'True 4k' it either suggests ignorance or a willingness to lie thats not to be trusted.
Always better to trust a review or an option that doesn't have an economic interest in what they're "reviewing."