I'm not sure if there is much purpose in getting it whitelisted.
Bitcointalk content is easily available on google. Some articles on bitcointalk are better than those on wikipedia. Perhaps more effort needs to be made in indexing those good articles on here and making them more visible. (Which the merit system currently does).
An alternative reference for the quote could have been:
https://satoshi.nakamotoinstitute.org/posts/bitcointalk/287/Forum posts used as reference are easy to be abused. Anyone can post something, content is largely unmoderated and the content can be edited afterwards.
You could also archive the content and use the archive as a reference.