A little bit hysterical, don't you think? Flybe/Blue Islands have multiple daily frequencies to both islands from SOU.
Loganair are offering seasonal flights to the islands for S19, and have found a quick and easy way to utilise the aircraft during the day by popping over to BOH and back between other U.K. flights. BOH currently lacks any CI services so there's no direct competition, and this route will be marketed to tourists rather than business travellers. For example, one BOH-GCI flight on an E135 per week probably won't be making much of a dent in the SOU-GCI market.
Good news for BOH though, an impressive portfolio of new routes for 2019.