I'd say pin it. For one thing -- we all agree it covers all the basics, and if nothing else, it's somewhere to send newbies to read up on the common questions.
While I like the idea of TFF Index entries being done only by experienced keepers of the species in question, I think for FAQs and the like we can be a bit more flexibile. I've written ones here that discuss, for example, Endlers and swordtails, neither of which I've kept in my life. My brackish book includes stuff I've written about species I've never kept, but been given information by people I trust. Certainly no fishkeeping writer will have kept all the fish he or she writes about. To some extent, we all have to draw from other sources of experience other than out own.
The key thing is whether the writer is putting down hackneyed old stuff taken from other books and web sites, or actually quoting the experiences of serious, talented fishkeepers. I think this guide satisfies this criterion. The information is solid, the experienced stingray keepers have weighed in and made corrections where required, and the article is easily as good as anything in the average aquarium book. In short, it has the makings of a perfectly serviceable FAQ.
Cheers, Neale