AoS / Skaven Legacy Compendium mess?!

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I don't understand what happened with last update of Legacy Compendium... + GHB 2017.

In the last issue, most of the units have disappeared (it seems that these compendium are more or less Errata FAQ things) from the Skaven Compendium for instance.
In the same time, all the Battalions were deleted... (Verminus clawpack, etc...)

I want to go full Chaos/Skaven Allegiance, without allies, in order to field clanrats as battle lines, but with keeping the opportunity to field a Plague Priest (pestilens) or a Warpflame engine time (skryre), and a Sreamin Bell (masterclan) if I want.
Is it still legit?

Can I still use the Battalions which were previously in the first compendium?
What about Ripsnikk raiders, available in Spire of Dawn?

Can someone tell me how I manage to use Battalion without playing Skaven without Skryre or Pestilens Allegiance?