Electrically and circuit wise the only plausible explanation is a flaky distributor ground or bad connection between the pickup coil and control box.
Many years ago I did experience a pick up coil with an internally broken wire between the distributor body and pick up. Most likely caused by the vacuum advance plate flexing the wiring. The car would randomly die but always restart. The internally broken lead wire WAS the reason.

Another one was an electronic conversion that had the control box main power wired to the wrong side of the ballast thereby limiting the available voltage to the box. Drove the owner nuts as well as a few other techs/ shops. That was about 12 years ago, the owner at the time was not totally convinced at the time that we had found the problem. It has never failed since
LOL BTW the symptoms were a totally random no start condition.

Not trying to start a p'ing match just saying Electrically and circuit wise the reported "fix" does not make me warm and fuzzy.

NACHO ???