Yep, it's rubbish. Just because it has a GW logo on it doesn't mean it's official. Official is something that you can take to a tournament and not have to worry about whether it will be acceptable or not, because it's official. Tournament organisers weighing up whether they'll allow FW rules just goes to show they're not official.
Sig, Tourniment organizers can restrict whatever they want. I remember one, I want to say Dragoncon, but it's been a while, where I didn't get to compete in the 40k tourney because Tournament Organizers had prohibited Codex: Imperial Guard and Codex: Tyranids.
GW shunted the BFG project, along with a heap of other games, across to SG. SG then instituted a rule review board constituting 2 SG employees and 3 fans. Then they instituted a process whereby rules would be published and then feedback received from fans before being ratified, abandoned or adjusted. This system worked well enough. The Necrons, Nids and Kor'vattra Tau are testament to this (if you think they have balance issues now, look at their original iterations).
While this process has slipped quite a ways it is still the case that new rules have to be ratified by the HA (who now consist of the 3 fans and 1 overworked and under-invested SG employee) before being official. "Ratified" now basically means either approved by the 3 active members of the HA and rubber stamped by SG or simply just put up on their website in pdf form.
Sig, I hate to rain on your parade, but there's a lot more strings to it then that. FW also reserves the right to produce offical minis and rules for them for every game GW has made to date.
FFG has gained an unnatural power over BFG through the use of a mythic substance known as Cashium to basically urinate on BFG's fluff, if they want to. In theory, FFG could even publish a totally legal, BFG list for the Calixis Sector and the only thing the HA could do in the short term would be to bend over and take it.