Is SpookyHash vulnerable to HashDoS? Aumasson, Bernstein and Bosslet did an excellent job demonstrating fatal weaknesses in MurmurHash and CityHash, but what about SpookyHash?

My first uneducated guess is that it would be much harder to create collisions, but not impossible.

My second uneducated guess is that it would be impossible to create the massive kind of multi-collisions required for a HashDoS. That is, an attacker could possibly create two or three messages that hash to the same value regardless of the seed, but not hundreds or thousands. And since a moderate amount of collisions are expected anyway in any hash table and cared for, the attack would fail.

Am I correct about that? If not, would it help to mix the seed repeatedly
into the state, like here?
Jean-Philippe Aumasson (the principal author of SipHash) has kindly
answered my question by email and acknowledges that he is unaware of
an efficient HashDoS attack against SpookyHash. This does not imply that
no such attack exists, only that he was unable to find one rapidly.