I don’t know but they don’t actually have to change the accounting treatment because you can rely on what used to be the simple ‘true and fair’ override (but is now more verbose/complex). Effectively if the substance of the cash flows conflicts with the legal form of the contracts you can, with auditor approval, follow the substance.
This is what auditors get paid to judge. The PL did not like the change but frankly it is not that unusual to see shifts in accounting policy like. We made almost exactly the same change at a major FTSE 100 in 2017 when we decided to build and own two factories and two regional logistics centres at the same time as part of a big expansion, rather than leasing, maxing out our existing syndicated facilities to pay for them before we eventually put in place specialist construction finance.
If it was me I would definitely have changed the contracts if the lenders were willing but with Everton