Do blacklisted people get a system message when trying to send you a tell, invite etc

[Ametrine]

My Blacklist was so huge at one point. I went to go prune it a month ago and noticed a whole whack load of 'Unknowns'. I'm assuming those were deleted toons, though I wonder if one name changes does it circumvent the blacklist?

(Unable to retrieve) means the toon was either deleted or server jumped.

Name changing doesn't aid in circumventing anything. It will update the name on Blist, as well as anything else.

What Blacklisting needs to do is erase a player from existence on our clients. The issues with it now is that it's likely too much to process that beyond muting them.