FB advice is dicey when you can't know who is who and what they've done. It's also gone and not a running record of how things got done for the future. I get it, with FB it's all about the instant gratification.
Anyway...
The transom skin is to keep the water out of the boat so I would skin the pitting and put an AL plate on the outside like I did on my SS. No it won't add any amazing things, neither will Starboard but it will keep the water on the outside.
I used .100 5052 AL, 3M 5200 and besides clamps that's all that's needed after cutting it to shape.