[Piotrsko]

I can see ring/land gaps being reduced enough that blowby becomes very reduced, perhaps as little blowby as a new bore. However blowby is not an indication of overall motor condition, it is an indication of seal efficiency.
I can see piston diameter being increased enough to not slap the skirt against the sidewall of the bore. I don't see the piston top increasing diameter mostly because you cant get the additive up in that spot. I don't see boron plating the cylinder walls, or if it did, not abrading from ring scraping immediately thereafter. Been my experiences you want to bake a newly plated surface to increase hardness.

Therefore, plating effect equaling a new engine is conjecture until tear down and measurement verification