It'd allow you access to the rod bolts. Take those out and you can pull the piston. At that point, it's open game for cylinder bore size.
Moreso for detensioning the rings I am thinking.
It was pretty ingenious -- I learned of this 2 years ago from Steve V. BTW, it was not caught the 1, 2, or 3rd time it went through tech from what I remembered. It was only an oil leak that caused them to take the base plate off the bottom of the block.
Working the limits of the rules (aka gray areas) are one thing -- this, is quite another.
I know of one other engine that this was done to for an open competition of beating the seal - that engine had a domed piston in it and roller rockers.
Ralph Helms told me probably 30 years ago at a WKA tech seminar that the "creative development department" (aka cheaters) works overtime coming up with this kind of stuff. Obviously, they are still creating and developing today.