Dealer suggesting ECM replacement on 2014 TDI Jetta SW 6MT - odd?

Car is still under TDI warranty, 100% stock.

Over the entire duration of ownership, the car would buck and hesitate around 3k rpm in 3rd gear - also a common driving speed, so it was frequent but could be avoided.

6 months ago the catalytic converter was stolen, and all parts replaced with new via insurance. Since then, the bucking issue continued but the car would randomly die during driving with no warning.

Took it to the dealer, hoping EGR might be addressed as part of the warranty. Service writer called saying the cutting of O2 sensors has been shown in other customers to impact the ECU, and that replacing it would be required and could be supplementally charged back to insurance because it's a safety issue.

However, this diagnosis does not address at all the hesitation at speed, and is entirely unrelated to the cat being stolen.

In the 30 cars I've owned, never have once have I seen that an ECU has to be replaced and feels like an extreme measure considering it's a lifetime part. Not like the car was submerged in water.

That feels to me like chasing replacing parts versus actually identifying the root cause, but curious on what you think?