Not stupid, just uneducated in electrical theory. Electrical engineers like myself know that you evaluate and specify digital I/O transmission lines with objective metrics such as Bit Error Ratio and Eye patterns, not flowery language and nonsensical buzzwords. Not stupid, but they apparently think the engineers that wrote the HDMI 2.1 specification and the Premium Cable certification program are so incompetent and stupid that a multi-$100 cable is needed to properly implement it, even over a distance this short.
In reality, you can buy Premium HDMI cables that have gone through the Certification program of the HDMI organization for 1/50 of this price. Even at 12 Gbps per pair (48 Gbps total), sending ones and zeros error-free over 7.5 feet ain't that hard. Note that AudioQuest is not listed as a participant in the Premium Cable certification program nor is it even listed as an HDMI organization Adopter, so "caveat emptor".