This is a bit cynical of me but I thought it was interesting: In the PDF their legal says this:
> in the years since, Fortnite has topped 350 million players and has become a global cultutral phenomenon.
Interestingly, this 350 million players number appears to have been announced back in May [0]. Of course it is somewhat likely that their legal team just Googled this number instead of sourcing an updated figure from Epic, but could it potentially be that Fortnite's growth has stagnated? It definitely feels as though it has left the zeitgeist compared to years gone by, and it could be that Epic has calculated that the payoff of this suit could exceed the amount of V-Bucks they were expecting to sell through the iOS version of Fortnite. Certainly a big gamble, but it's possible that the situation may be dire enough to make it worth it. Of course they attempt to make it look like this isn't what they want by not demanding a cash payoff, but the obvious play is that if they win then a) they will be able to sell V-Bucks again for presumably a higher margin, and b) they will launch their own Epic app/game store and take a small cut of those transactions.
I think you are reading wayyy too much into this. The most likely explanation is that the document was being worked on for a long time and the figure was added back then.
https://www.theverge.com/2020/5/6/21249497/fortnite-350-mill...