Speaking as a current RAF FJ operator I can confirm that this is completely made up.
The problem the RAF currently has with manning is the inability to train aircrew. (Probably worthy of a whole different thread). The training system is running beyond capacity. Therefore unless a BA / VA etc secondee / rejoiner is at a standard to immediately start an Operational Conversion Unit or rejoin straight at the Front Line, then unfortunately I think the best they can hope for is an aviation related ground role.