Since all of his music is R&Bish auto-tuned, not that hard for a computer to generate that sound. (I have to admit, I've hit the "get off my lawn" phase, missing the "good ole days" of "real music" ie 90's hip hop)
I found another article that states they had a real human voice sing the lyrics (then auto-tuned it to Scott's style), but there's no actual sources here, or on any other articles I can find.
https://musebycl.io/digital-data/agency-used-ai-make-travis-...
A more exaggerated example would be artists that use a vocoder (e.g. Daft Punk or something like that), which would be even easier to synthesise convincingly because the real vocals are also mostly synthesised.
(not UK Vibe Squad)
ish: https://www.dictionary.com/browse/ish
So, having an aesthetic similar to rhythm and blues.