I could be wrong, but the basic implication is that Lalo somehow managed to get a member of the dev team on his side, and that member told him about the match with Propon. Baku's ultimate plan seems to have been getting a pair of level 90- or so high classes to stomp out Shoudo's numbers with sheer strength, and maybe even make one of them King in order to beat Nobuko with the stats. But this guy leaked that battle, and Lalo found a chance to destroy Tipa. Said guy, I think is the one Lalo was talking to about the lack of food during chapters 398-399.
The problem with this idea is twofold. First, how did Lalo manage to convince a member of the dev team to his side while being watched by Kakerou? Second, what forces did Lalo even have to pull this off? It seems to imply that the slaves had some way to win in-game while still being slaves.
Present day, the dev team is also being targeted, though I feel like this is Daiba, and not Lalo's doing.