The fact that your quote starts with the word "some" should tell you everything you need to know.
Re:Why I’m Leaving Elm
by davidcuddeback on Thursday April 09, 2020 @06:35PM
(#22827916)
It doesn’t tell me which or his opinions he thinks are backed up by accepted definitions or what he considers an accepted definition. So no, it doesn’t tell us anything. It sounds more like a weasel word to get out of providing citations to back up his arguments.
Why not? The OP claims that his opinions are explicitly mentioned in accepted definitions:
> some of which are explicit in accepted definitions of the term
If the OP is going to make that claim, why should we not expect to be able to find validation for his assumptions in a written definition of open source?