Agreed that transfer fees are always going to be subjective, and you have insane money being thrown around by tons of clubs. Hell, maybe the Kellyman fee ends up being a steal for Chelsea in the future. If you told me that United bought Kellyman for 20M, I'd probably think they overpaid but that'd be normal. If Chelsea overpaid for some teenager from France, then so be it.
But I don't understand why certain people here are pretending this was an expected outcome and not mainly a PSR scheme. It's less about the fee, and more about all of the teams in PSR trouble swapping players with each other a week before 6/30 rather than selling to other clubs. The only way they could have made it more obvious is if they put out a press release with some table/calculation showing exactly how they intentionally structured the deal to comply with PSR.