Yes indeed the naming issue is important and needs to be addressed. We are currently pretty busy with stuff so we haven't even started implementing the aforementioned proposal (or considered whether it's a good idea).
No the new design does nothing against such DoS attacks. Please see tor tickets #16052 and #16059 for some plausible ways forward. We would need more help from the community to design and develop solutions to handle the DoS threat.
I've tried to communicate with the hackerfactor person about this and figure out ways forward, but I received unproductive responses which did not make me want to proceed in discussion.
We need the community to help us understand how they best want to manage the DoS risks and build sustainable proposals to fight them.
Also see this blog post: https://blog.torproject.org/cooking-onions-names-your-onions