Making Massimo's comment into an answer:
Mods have a wider view of certain users' behavior, and when we nuke as spam or rude, it's because there's more evidence.
We can't comment on this case in particular, but I will provide another data point in general. Just this morning, a few of us mods were discussing a different question that we felt should be closed as too broad, but we ended up not taking any action (even though 2+ moderators agreed!) because mod votes are binding, and we hesitate to take that sort of action unilaterally. You can imagine, therefore, that we apply a correspondingly greater degree of care when it comes to "nuking" questions entirely.