Well, what options were there?
"There are numerous ways for TDF to contact the AOO project and, from what we can see, none of those were used instead of the somewhat impersonal and semi-confrontational method of an 'Open Letter.'"
How else would they get a response? It's pretty common now to release stuff into the wild in order to provoke meaninful responses. Sent in a bug to a company that said it was out of scope for a bounty project? Release into the wild after a time and let natural selection sort it out. That's the way things are done now you silly person.