I don't happen to think that Durability Negation is valid. The primary reason for that is because it is due to him attacking a specific part of the body. Durability Negation itself is an ability which allows the user to bypass conventional durability with an attack. But this gets hardly nerfed by what Pressure Points is.
Pressure Points is attacking those points which cannot be trained by you in any form, like your internal organs (e.g. you cannot actually train your balls to take attacks, painful example, I know). Durability Negation, however, is not just related with some points of the body but the entire opponent body. Durability Negation would mean that if I were to attack some part with 10 kJ durability with my 1 kJ attack, it would still be an attack, and the opponent would still feel pain.
The throat region is a very sensitive spot, your entire throat is not covered by muscles but only some parts, and the carotid vessels in the throats are used to actively measure pulses, along with the wrist vessels. And we do know that they are somehow superficial compared to other sensitive vessels. Making the neck a good spot to do an attack and suffocate your opponent, as carotids are one of the primary vessels for delivering substances to brain. Not being that covered (except for few layers of epithelial and the three tunica layers of the vessel itself), it would mean that it is not even comparable to other parts of your body, meaning that something like your chest or higher abdomen which is covered with muscles (and actually has durability of its own) is much more stronger compared to that specific spot on your neck, as you can actually train it.
The neck, however, is a part where attacks counting as DuraNeg would be kind of absurd, only because it doesn't have its own durability (like any major bones or muscle), and because the attack isn't "negating" any durability, it is much like attacking a spot where the concept of durability hardly applies.