If my math is right, that would mean the 1,300 members donated an average of 131,000 euros each.
I'm sure there are some JWs in that area that might be able to contribute that much, but I'm slightly skeptical it's that many. Although doing the math....there are just over 100,000 JWs in Spain (based on a quick Google search...not invested enough to dig up the yearbook figure), so if this story is true, it looks like the "one per centers" of Spain's JWs got taken.