Ahh if you have the recover phrase - yes you have the private keys and will be able to access them

Good think they have changed it (I used them in the beginning and do not remember how it was back then 4 years ago..)
But as they give you the keys it is you how has access to the wallets and you will be able to access them the same way you did with BCH

Well... when I claimed BCH I did it two ways.
...
However at the time of the BCH fork I didn't have any BTC in my main blockchain wallet it was all in imported addresses, so I havent ever tried to claim BCH using the recovery phrase. Im not sure how that process works and which wallets etc would have been used at the time in that process.
I have since moved my BTC from the imported addresses into my main blockchain wallet address, so in my case the process for claiming BCG is going to be different to how I claimed BCH: I'll have to use the recovery phrase rather than the exact private key associated with each imported address.
I assume the process will be as I posted above. Using a wallet other than blockchain, that supports BTG and supports importing addresses via a recovery phrase.
As far as I know blockchain.info wont be supporting BTG straight away, and if they do provide support its likely to be weeks / months after the fork, like for BCH.
But yeah, I think we can use the recovery phrase to claim BTG with another wallet. Hope Im right about that.
Yes you will need to find a wallet that supports the forked coin and passphrase in order to access the forked coins.
Also remember that with the passphrase you will be able to access any BTC as well (if present). so remember to move the BTC (if you will not use it soon I suggest paper wallet)...