Audio video. Starlink has 2-player splitscreen Co-op for campaign. For local, BO4 has 4-player Zombies, but only 2-player for Competitive Multiplayer. Blackout has 2 online! Link:
The exception thus far is Destructoid's review of Black Ops 4.
Starlink: Battle for Atlas and Call of Duty: Black Ops 4, two big games both big on splitscreen, provided me with another round of reviews for me to check out.
Regarding the mention of splitscreen, Starlink is not that bad. But very little I've seem from Black Ops 4's reviews. And when one takes into account Blackout's 2-player online splitscreen support, I start to scratch my head, wondering why would they keep it secret... or so it seems.
Call of Duty: Black Ops 4 Statistics For Split Screen Gaming League
Currently, Split Screen Gaming League has 1,917 views for Call of Duty: Black Ops 4 across 11 videos. The game makes up 4 hours of published video on his channel, making up less than 0.83% of the total overall content for Call of Duty: Black Ops 4 on Split Screen Gaming League's YouTube channel.