RB made a point yesterday of visibly demonstrating the device to the FIA inspectors. Bodywork removed, pedals removed, some pipe work removed, and a special 2 foot long tool required to make the adjustment.
Clearly there is no way in hell they could tamper with that under Parc feerme and not be spotted, so it's a non issue. The drawings have been visible to all teams on the FIA servers for over three years so it's difficult to see how they could have been trying to hide anything of do anything sneaky.
Rumours are Zak Brown, the pounds shop Tonto Wilff, is the one behind the complain the FIA and the one driver outside of RB that has commented is one of his... (actually my favourite current driver, so I'm a bit disappointed.)
So no evidence of cheating, and an investigation has shown it would be impossible to make the adjustment under parc ferme as alleged, yet the team that have sailed close to the wind with flexi wings- and lost a few points of their advantage now it's been stamped down on - is the one that feels it has the moral high ground.
A sign of weakness there from Brown, and if his team loses the drivers championship by a narrow margin the shareholders should be asking him why he felt it wise to waste time and resources on an irrelevance at a crucial point of the championship.