Nobody ever claimed that all relays HAD to strictly abide by everything. They should, and it is important for the protocol - but there are so many relays indirectly linked to others that share notes back and forth, there is a high chance of if you post it once, it's out there - and potentially forever.
Deletion is more for when you *just* posted something, immediately realize you derped, and click the delete button as fast as possible, if your client has it - and then having to pray that it wasn't already sent on it's merry way across the network of relays. x)
nostr:note14kvkmaw9wr4anc44a5988ww8hhx032kfvgfy8mexchsglm0g9p3sa8sffa