The quote definitely exists that it would be difficult to reach Garabandal for the miracle and that FEW PEOPLE WOULD BE PRESENT. I think it is NOT clear if this was due to a virus or war or geological disturbances or some other factor. I believe this was in a locution received by Conchita from Our Lord. Glenn can certainly provide the evidence. The lady in the video below (in Spanish) was a witness of the events and confirms this was clearly stated at the time.