I can’t tell if you’re kidding or not so I’ll just answer straight up. WiFli only refers to a mid cage rear derailleur. It has nothing to do with wireless or the communication involved with eTap.

EDIT: more specifically it refers to their derailleur’s ability to wrap larger gears than Shimano. It’s a really stupid and non needed marketing term that confuses people when it comes to a wireless group. WiFli has nothing to do with eTap other than the derailleur design and it’s ability to wrap gears. Same as any non electronic derailleur they have in their lineup. Specifically though they only “offer WiFli” on mid cage and longer.

https://www.sram.com/sram/road/technologies/wifli