The transfer of the Streetlites is permanent. It is because they are having more frequent major unit failures operating the X4/X93.
Absolutely nothing to do with any additional work they are having undertaken.

Yes, Redcar gain older Pulsars from the swap, which will be better suited to the terrain of the X4/X93 and such, but conversely, it also makes Redcar that bit more attractive for a new vehicle business case too. There is mid-term logic behind it.