@ChrisMayLA6 The same approach worked rather well during the Blair/Brown years.
Using private entities in the short term to clear the backlog was however accompanied by significant NHS investment to in the longer term to remove the reliance on private support. Streeting wants that outcome but hasn't committed to the spending to get there yet — which is a legit area of concern — but I've not seen anyone serious argue that using private capacity to reduce the backlog won't work.