Correcting "barrel angle" for the purpose of using a receiver sight is nothing new, companies and smiths have been bending barrels for a long time.
I'm an international competition shooter, gunsmith and have been playing around in the marvellous world of guns for over 34 years now, but I've never ever heard this kind of nonsense before. You don't ever bend barrels for the sole purpose of changing the sight line. For one, canting will become a HUGE issue if you do. Second, you have to have very special measuring and bending tools in order to do this without changing the inner diameter of your barrel which will result in inevitable loss of accuracy. And last but not least, bending just doesn't make sense in any way, because changing the sights by using risers, scope mount shims, MOA rails or adjustable scope mounts, is cheaper and safer.
Ask any gun smith or gun manufacturer of bending a barrel makes sense in any possible way, and the answer will be either be "are you serious?" or "have you completely lost your marbles?".