Nope...Sorry...Incorrect!!!!
Sorry gents,
This IS NOT THE CAPTAIN'S CALL (whether or not to be de-iced / anti-iced with snow/ice on the aircraft's lift-producing and control surfaces).
We have:
1. Aircraft certification criteria (The aircraft is not certified by the manufacturer to take off like this.)
2. Regulatory constraints (I don't know about Spain, but in the U.S., this is illegal as XXXX.)
3. Company SOP. (I've never worked for a company that had in its manuals permission to take off like that.)
The only time a captain's decision comes into play is when, FIRST, all three of the above are satisfied AND STILL the captain is not satisfied that things are safe. In other words, the captain has the authority to say 'No' despite the fact that 'all the boxes are checked'...but hasn't the authority to say 'yes' when one or more of the above authorities say 'No'.
Fly safe,
PantLoad