According to WitchHat Audio (started by ex Naim engineer), it was posted on PFM that this is not the case & something Naim haven’t bothered to clear up on the forums. The upgrades do not power L & R independently, they power different power stages IIRC. Numerous people have powered their 282 with non matched power supplies, some even from different generations (ie DR & non DR to even Olive).
I power my 282 with non “matched” supplies & have no issues or channel imbalances, etc that some in the past would claim to be the case if you did so.