Thijs I got a reply from the API Product owner. She confirmed that Rabobank probably isn’t aware of the PSD2 complaint API that bunq has.
Or maybe don’t know how to use it... or doesn’t have the time... or whatever. So, in short: Rabobank can resolve it themselves!
For example, ABN AMRO recently connected to this PSD2 API without any issues ;)
I will poke Rabobank, because their text is slightly misleading! ;)