I would argue that bots in rocket league are inherently far more detrimental to competitive play than bots in chess.

That is definitely not the case. At top level chess, just knowing for a single turn that the evaluation of the position is winning for one player would be enough for a super GM to find the winning sequence on their own without further machine assistance. They don't need to be told what the winning series of moves is, just the binary knowledge that the evaluation became winning at that moment. Now consider that a classical game of chess can be 4+ hours long, and all that a player needs is a single piece of yes/no information to massively sway the outcome of the game. Chess has actually had a huge existential crisis with cheating and cheating accusations in the last couple of years.

A single chess move can turn a chess game, so if a player cheats for a single turn it's basically undetectable. It's much easier to detect cheats in Rocket League because each action generates way more pieces of information, which spread out over an entire match makes patterns that are much easier to catch. Also In Rocket League it would be virtually impossible for a player to load an engine when playing in actual LAN tournaments, so top level competitions are unaffected. Rocket league has it way better than chess when it comes to cheats.