I mean just to play the devils advocate. 

None of the NIPs are enforceable, so even if nip-09 exists, there's really NOTHING you can  do about a relay that doesn't honor it,  other than trying to make sure your note doesn't reach it, which is very hard since anyone of your followers can broadcast it to such a relay.  

Its really not much different than someone screenshot-ing your tweet. 

I like @rabble 's  take on being able to dissaciate from your note atleast as a signal.  

 nostr:nevent1qqswzks26hvt4pg9rjcr6fhu4hl823hvkefv6w7clrjdqerjq32tx4sprfmhxue69uhhyetvv9ujumn0wd68yurvv438xtnrdaksygzwhzp3p445ak2ud4n289dn6084txu9ltkg7a53mt75qk5jup2ad5psgqqqqqqsqxvd2g 

 Also:

nostr:nevent1qqsvvjj79hngatu0ak0k7fzxx7vyngnvw0mezmyd683xl7ws2k59knspr3mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmqzyp8t3qcs666wm9wx6e4rjkea8n64nwzl4my0w6ga4l2qt2fwq4wk6qcyqqqqqqg35vvhs 

 Good, but again "none of the nips are enforceable" trying to use the law to scare people into deleting might actually work for big relays, but "you'll never know" if it actually worked. 

 It's okay for messaging and maybe even closed groups, publicly available notes are "publicly available" trying to remove them is almost futile.