It absolutely is telling people not to do it. If your intro to a peice of content in the game says "it's not popular and nobody does it," that stacks the deck against anyone else doing it. It's not something that needs to be said. It is biased against the content and discourages people from trying it.
A wiki article about a game feature should not be judging its merits. It should be simply presenting the details of the content and letting people make their own decisions. If something is unpopular, people can tell that pretty easily based on the details of it and coming to the conclusion themselves they don't want to do it because it doesn't seem interesting. That's called making decisions for oneself. This article effectively makes the decision for them.
Compare this to the FFXIclopedia article, which contains all the same information but not the jabs at its popularity. That by itself makes it a better quality article as it isn't prejuding the content for you, it's merely presenting the avialable information and letting the reader form their own opinion. It's things like this that get in the way of them improving their reputation. (side note, BG doesn't even have the correct area name for Diorama Abdhaljs-Ghelsba (whose page is also mostly blank), while FFXIclopedia has a complete page about the zone. Tell you what, I'll go ahead and make an account to rectify these deficiencies. Don't let it be said that people complain about these things but never do anything about them
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Based on his response to the above discussion, I can not agree with this statement, as he is advocating a biased writing practice.
And even if he quit today, BG would still exist, and the other resources out there would still exist, people would still disseminate information. If he quits, someone else will step up to the plate, it's that simple.