If I send my bitcoin to blockchain now, will I receive bitoincash? Or it only applies to people who store bitcoin from the first
This is a scam. If you give your private keys to ANYONE they will be able to move your coins where every they want. You will get robbed.
Seriously, ignore this shit!
Yes. If someone is asking you for your private keys, it is indeed a scam attempt. But OP is not doing that.
He is only teaching users on how to export private keys from Blockchain and even telling you to use Electron Cash - where he don't have access to your private keys - so you can spend your BCC safely.
I would only call this a scam if OP was telling you to send him those keys (which he is not).