RAIM check can only be carried out by some operators preflight as aircraft are unable to detect it or access the (internet or ground) sources to retrieve it in flight.
If RAIM is therefore suitable preflight it can be used unless ATC advised to the contrary, they have access to last minute data.
In the OP follow up post he advises he is an ATCO and asked why aircraft asked to do such an approach when RAIM is not suitable.
Possibly the crew forgot to check preflight or perhaps their company manuals do not require them to do so (I doubt the latter).
If company does not include RAIM prediction for destination by default on the flight plan it usually requires additional crew actions preflight to access this data from another source, this can be time consuming and hinder an on time departure, or simply can be forgotten.
It would be recommended to advise operators to include this data for crew to read as standard during preflight, making them aware.
With RAIM outages far and few between with intervals not exceeding sometimes some minutes in EU, it is easy to miss an outage especially when they are printed in a graphical timeline of 3 days instead of numerical readout. Black and white printers producing the colour image also do not aid the crew in this. Just some random issues observed...