A FlyerTalk Posting Legend
Join Date: Sep 2012
Location: SFO
Programs: AC SE MM, BA Gold, SQ Silver, Bonvoy Tit LTG, Hyatt Glob, HH Diamond
Posts: 44,467
The wiki is out of date until someone flies on it and confirms. I was recently on a CR9 that was explicitly marked as "not installed", but wifi worked.
No reason to believe the same thing isn't the case here. But I'm not booked on any 788 until the 27th, so hopefully a more frequent flyer can confirm it.