Floating Offshore Windmills

Who does floating windmills get listed on AIS?
Here is an example. The first test windmill positioned outside Utsira, Norway since 2008 and still in use to test out new technology in full scale:
https://www.marinetraffic.com/en/ais/details/ships/shipid:850504/mmsi:992572500/imo:0/vessel:UNITECH_ZEFYROS