If he had been UDT, he could have used the label SEAL.
All UDT can call themselves SEALs, since a few years ago.
My Uncle was UDT, never called himself a seal, and only his Wife would talk about what he did after he died from his injuries after years of suffering.
A few years ago, I met a UDT guy. He was very aggressive in saying he was a frogman, not a SEAL. They guy I met told me about some interesting intelligence missions during the Taiwan crisis in the late 50s, but he wanted me to understand exactly what he did and didn’t do.