It makes no sense. A false belief that premium glass will make that much of a difference on a rimfire at short range. I understand limiting the internals, barrels, etc. Optics? They might as well limit the reticle style as well. The shooter and the ammo are far more important and they aren't mentioned...
There is a big difference between seeing the target and seeing the subtle atmospheric subtleties that can be used to affect precise shot placement.
Your statement is perfectly true for a person who does not know how to shoot, or one who relies entirely upon a Kestrel for windage and elevation. Or possibly inside 25 yards.
Someone who does know how to shoot, will rely on good glass to evaluate the mirage and spot bullet trace... that is just not possible to do acceptably well with a Diamondback Tactical for example.
For that reason, if the best scope you have is a Diamondback Tactical, you will never really learn to shoot well. Sure you can try, but you will never get good at it because you cant see what you need to see to get good at it.
The only real question is what is the worst glass that can meet the minimum requirement.
Speaking of mirage, a common statement made is that good glass can see through mirage and that is false. Even if it were true, the point would be counter productive.
How mirage can seem to disappear would be with a shallow depth of field like many air gun scope have, because focus is used as a range finding method. Outside of air gun distances, it would not be helpful to use such a scope.
A shallow depth of field will result in mirage that is hard to read and a distorted image. It would not make the image clear in the presence of mirage as though the mirage was not there.