I respectfully disagree. Maybe I can convince you otherwise.
Firstly, there is no reference to a specific battletome it just talks about which units will be good in 3.0.
Secondly, when do you think the new battletome was written? I doubt the new battletome was written, tested, printed and ready to shipped in December if they started it after June. It takes longer to produce than that.
I think therefore they were already playtesting the new rules and the "errors" in the article are actually because the author is talking about the new battletome.
You're right Ws do not matter - my bad. Still they have 7 currently so moving to 8 as stated in the article. I am not convinced its an error. It might make sense if they are losing the 5+ ward.
On only getting one model? What do you think the rumour engine is then? Not a nurgling?
Just curious.
At least the pessimism over the new battletome is fitting for Nurgle!