I imagine a pretty significant portion of Australia's Sports loving public has access to Fox Sports these days.
Across the services which sells it 1.7m have traditional set top boxes, 200K have it via Foxtel Now and then 1.2m have Kayo. That's 3.1m of 9.8m households, with Kayo's prevalence possibly higher as it feels like everyone shares their account.
Now for your casual Sports fan, they are far more likely to watch a replay or some sort of highlights package like Kayo Minis than get up in the middle of the night to watch the World Cup, which Fox does better than the FTAs.
Fox will lean on their relationship with the NRL to help push the tournament (there is already more coverage on nrl.com about the tournament than usual) to drive awareness and the FTA News will pick it up as it approaches because there will be some stories that will come out of the tournament.
Overall, I feel Fox/Kayo is still a better partner and a better outcome than what could have happened (Sportsflix, Stan Sports, Paramount+)