No, the IEP contracts have massively skewed “leasing” costs because, like some other newer contracts, they are a full train supply agreement, not just a lease with, maybe, L5 costs included. The DfT also negotiated them!
Elsewhere, pre COVID, the total amount of rolling stock leased was going up, not down. Financing remained competitive and, even today, you can still get very good lifetime financing rates, better than you would have to pay the Treasury if you were the DfT.
Headline figures rarely tell the full story here.