Nuance is just meant as an ironic synonym for rps in CEO.
A rush deck is a deck which tries to create an advantage or win at the very start of the game, typically by fast development.
I agree on banning hoplites. Hoplites are quite good rn and rush games really create rps instead of skill based games. Imo there aren't other viable rush tactics with ceo pieces rn tho, especially here, since Dovewall uses Sk++, so I wouldn't concern banning other rush pieces than hoplites.