Transon repair

[NoBones]

If he used Gits Rot, all it is doing is prolonging the
inevitable. Which means slice and dice on the transom.
Remove a screw from IE: trim tab, transducer, ladder, etc.
If any thing weeps out. Not a good sign.
Good luck, Ken

[Scott]

I would like to think a properly restored transom would NOT require a "plate" (recored and glassed).

It almost sounds like he used a product like Seacast. I dont know if products like this require a plate. That is something a surveyor should have a look at.