No, and maybe.
“Censorship resistance” qualifies anyone’s ability to publish anything at anytime, without concern of being “banned”.

“Spam proofing” refers to an END USER’s ability to filter their OWN feed as per their OWN content wishes. 

Nostr, as freedom tech, needs to shine in both of these abilities. 

MAYBE proof of work solves for spam resistance, but maybe sometimes it doesn’t. There is no silver bullet, and the best (open source and client agnostic) WoT algos will incorporate many user configurable filters in order to accomplish this task. 

My Grapevine is building better WoT algos for Nostr. https://grapevine.my