I'm convinced something got lost in the translation.
There is no way any pilot, regardless of status, would ignore a collision report and carry on without a just to be sure check...
mini, notwithstanding what the report says, I think herein lies the answer. Remember a ground incident in USA where vital time was lost in a fire because the cabin crew could not explain in clear simple english where the fire was and how serious it was.
Ryanair employ a multiplicity of crews from many different cultures/backgrounds/countries. Nothing wrong with that but although flightdeck are required to prove proficiency in English to a certain standard as par of licence renewal there is, as far as I am aware, no legal requirement for cabin crew.
I am sure if this Captain had received a CLEAR unambiguous message that their aircraft had been in collision with another aircraft AND that there was suspected damage the outcome would have been different.
Am not blaming any individuals here - this incident was a product of the "system" and includes elements of minimal experience (FO), lack of training, culture, language etc