Caveat - I have no specific knowledge of the referenced matter.
Generally, an operator will run an NTO (No Technical Objection) request by the OEM before implementing a local protocol. If the OEM has a concern, that should be identified back to the operator. If not, the OEM generally will issue an NTO relating to the request.
It may be that the OEM didn't have all the story and made an inadequate call or that the operator didn't go through the usual processes - I would be surprised if that were the case for QF.