what he is saying is Zelda gameplay does not need a Hyrule setting. You could set Zelda anywhere and anytime and have the same game mechanics and it would be the same game. If link had black hair instead of blond hair and it still played the same, or if he wore red instead of green(that does happen though). There is a lot you can change about something without changing the core fun game mechanical elements. Like for instance i have been dreaming up this machrider idea
replace link with mach rider
replace epona with a motorcycle
replace his sword with a baseball bat
replace dungenons with warehouses and abandoned facilities
replace his hookshot with a chain
replace his bow with a plasma gun
replace hyrule with a deserted city
replace lizfos and stalfos with cannibals and morlocks
different music
keep tingle the same
Cosmetically the game would looks completely different, but the mechanics would still operate the same way. He'd still push blocks, ride things, attack things with some sort of blugenoning melee weapon, hed still be able to climb up things with some sort of chain device, he'd still be able to shoot things, there would still be racing mini games, shooting mini games, puzzle solving, etc.