Having had a look at the timetable in a bit more detail it would suggest the Gatwick flights have been pulled / reduced mainly around times when the Embraer is probably on Aston Martin F1 duties. However there are also large holes in the ATR schedules at times.
As for the AirBridge, the IOM was happy for it to operate when we went down to 7 day isolation over the summer last year. The landing paperwork you had to fill in for arrival had a section that you had to sign to confirm that you had not been outside the IOM or Bailiwick of Guernsey in the previous 14 days - If the case numbers get too high in Guernsey the IOM will probably pull it with immediate effect and send the Guernsey people home again I should imagine.