Could be the facebook page for the venue? Not sure. Why, is something making it look like just a fan page to you? I'm not a facebook user unless I'm looking for GNR streams.
It seems to me tickets would have already been on sale for these but then again I don't know how that usually happens down there. Then again I was expecting Europe tickets for next summer to start popping up right about now.
Exactly. No announcement from any reputable source (media, promoter, GN'R!).
In the past, someone (venue, promoter, local radio station) would tease something. Then you'd get an official show/tour announcement from the band, promoter and it would be reported by the media. GN'R's social media accounts would post about it, the dates would be on the official site and probably posted here too.
None of this has happened. Instead someone's created events on Facebook.
/jarmo