Where he "got it" was probably on the airplane or in the departure airport (IMHO) if he left on the Tuesday or Wednesday before. They seem to be giving the Omicron strain an incubation period of about 3 days (from infection to symptoms) which is a bit shorter/faster than the original (~5.6 days).
So, unless he was on-island for a week or so, he brought it in himself.
Probably will not affect our travel plans unless Lynn's next med. appt's (tomorrow) cast a shadow things.
Tally-Ho!
Mac