The inspection regulations covering frame rust for non-commercial vehicles are in 540 CMR sec 4.04 sub section 12 paragraph f

https://www.mass.gov/doc/rmv-regulations/download

(f) Frame or Unibody. Broken, cracked, modified or rusted structural parts of the undercarriage or unibody so as to cause a hazard or structural weakness.

I doubt the repaired area would cause any issues, unless, it was poorly done and didn’t address all of the damage to the frame. That being said, it’s really up to the inspector and how they look at the repair