I think you're referring to those reviews on Amazon.es, don't you?Thank you. I agree. However, that UGreen "Cat 8" cable has 37,220 reviews on Amazon with 82% giving it five stars. Searching through the reviews seems to indicate that it works for 10GbE. And 32.50 euros for 15 meters or 40 euros 20 meters is not a bad price. The Primewire flat "Cat 7" cable has 76% five-star reviews and is 14 euros for 20 meters.
Molex looks great, but I can only find bulkwire here.
Not wanting to rain on your parade, but those reviews seemed paid for and not "true". (The first one is hillarious. Almost copy/paste of an UGreen advertisement).
Stick to Cat 6A cable as other members advised you and you'll be fine.
Edit: Typo
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