Thats quite a big allegation. The reality is GIB is a small market (6 hotels) and flights have increased substantially. There just isn’t the demand to fill all these services and have somewhere to stay.
If GIB was being used as a backdoor to Spain it would end up Amber listed like other places which have been used as backdoors to other destinations. No positive tests from any green list passengers were received so even if they were all going to Spain they caused no risk to anyone else.