Yeah, "4K TV resolution" doesn't mean anything as that completely ignores viewing distance. Pixels Per Degree (PPD) is the core metric and it drives me bananas that marketing professionals continue to intentionally obfuscate basic facts about products for sale.
I assume they're just ashamed that after billions of dollars in product development, they were unable to obtain the requisite 35PPD necessary to emulate a very basic "virtual computer monitor" and display readible text - or get close to the 62PPD that actually represents the limits of human resolution and is the golden benchmark to shoot for.
Maybe they did achieve these goals, which would be impressive, but without using standardised meaningful metrics for HMD resolution you just can't tell.