How should this be pronounced? This says seeut ... should it be SHoot ?
Sounds fine to me - there is no /sh/ in this usage of the word.
Why not? Isn't SI supposed to be pronounced SH ? Is this some regional thing?
Everything I've found online about Welsh pronunciation says SI = SH
Nothing to do with dialects, etc. No /sh/ in this usage of the word - it is probably a loan word from the British English 'suit'.
Pronounce it like the English "Suit" but purse your lips to make a defininte "w" with a "t" at the end. I.e. "Soowt"