Actually, they didn't endorse condom use. I was in Spain when this happened and followed the story. One of their representatives (not even a bishop, IIRC) had been in a meeting with somebody in the government, and reporters ran up to him right after the meeting with this question. He was responding to a question on the attitude of the government, but it came out as if he was stating the position of the Church. As soon as the headlines broke, the bishops corrected it - but the damage had been done. The positive side of this is that, for once, Rome did not seem to be napping, and actually asked them to explain themselves and then to publicly clarify the situation, which they did.
That said, Spain is full of accomodationist left-wing clergy (the same kind we have in the US - Jesuits, elderly 1968 "revolutionaries," etc.) who would be only too happy to go along with anything the government does. But this was not the case here, and the bishops's conference never endorsed condom use, wishful thinking of the left to the contrary.
Thanks for the info. I never saw a follow-up or clarification regarding that story.