It's a perfect argument. You declared that Spain (and Portugal) would likely not help in a NATO action. Yet, recent history proves you directly and unequivocally wrong. Spanish blood was spilled to prove that point, so maybe have some respect?
>How many times has Spain been attacked? Not a great argument.
>...
>And Spain in particular is unwilling to increase defense spending - why is that?
You answered your own question. Well done.
Note: I'm not supporting their decision, just pointing out that it's arguably quite rational from a certain point of view.
Lastly, the linked article still doesn't say what you claimed it said. If you were responding to a falsehood, that doesn't excuse confidently posting another falsehood.