There has already been a serious proposal for a HVDC cable from Morocco to the UK. If that's possible, why not go for Spain-Germany?
Spain has also floated he idea of a HVDC cable to the UK, but it's never happened.
Sometimes, headlines are out of control.
Hvdc in the ocean requires way less right of way than hvdc over land. Running oceanic hvdc from Spain to Germany might have some trouble in the English channel where it would be in territorial waters.
Spain to UK might make more sense.