Well that sounds good from Carlyle, but the proof will be in the pudding.
Certainly Stobart/Esken have made several mistakes in their time in management of SEN - making GA and aviation maintenance and support companies unwelcome, forcing JOTA away, refusing to allow BA to use their own ground handling staff and thus losing the weekend flights on offer among others - but they did invest a good deal in the airport and had several notable successes.