If these people have no assigned duties that seems pretty crazy. Tipp IT is not all that old so you would imagine that these people are capable of doing something useful. In addition, the fact that they are above “an approved level of staffing" is pretty meaningless. The “approved staffing levels” are basically whatever the staffing was prior to the crash less a fairly arbitrary and cumulatively significant percentage. The ITs only just about still work within these arbitrary “approved levels of staffing” as the staff were forced to teach an extra module or two. This only happened in the ITs. This imposition is supposed to be temporary and is the subject of industrial action which started recently. If the forced extra modules are reversed then presumably the “approved level of staffing" will have to rise significantly and these people will be at a stroke no longer above “an approved level of staffing".
If they indeed have no work to do (and one can’t conclude that from them being above “an approved level of staffing"), they cannot be made redundant as the Govt won’t fund redundencies. They can be put on a transfer list but can only be taken by ITs which are below “an approved level of staffing". So there could be other ITs with work for these people (if indeed they have no work to do) but they would be precluded from taking them as they are also above “an approved level of staffing".
The phrase “above an approved level of staffing" covers a multitude and sounds great in newspaper articles. It is however pretty meaningless.