https://www.espn.com/nfl/story/_/id/32486646/los-angeles-rams-owner-stan-kroenke-angers-nfl-owners-financial-pivot-related-lawsuit-st-louis-move-sources-say
I think Kroenke feels like someone related to another NFL owner tried to sink him with St. Louis and so he feels he shouldn't have to pay up as much:
"But in 2019, an ESPN report on the Rams-Chargers marriage detailed that discovery in the lawsuit had turned up an email from an official affiliated with the competing Carson proposal that outlined to St. Louis authorities all the ways the Rams seemed to be in violation of the league's relocation policy, providing a blueprint for the city of St. Louis' lawsuit.
A source close to Kroenke says now that the Rams owner believes that some of the legal issues arise from that email and that after building the stadium and agreeing to house the Chargers as a tenant for $1 a year, he shouldn't be responsible for all legal fees."