It's easy to test with a hacksaw, and a length of replacement pipe!
I did wonder that myself but kinda ruled it out for now because there was no evident slow deterioration of the exhaust. No funny rattles or noticeable gradual loss of power. Car ran fine, turned it off and sudden problem!
I know there is a vacuum pressure test that can be used to determine possible exhaust blockages but can barely get the engine off idle so might not be possible to test.