It sounds like total bs from a guy that doesn't know a thing about BTC
Since the other part was already addressed, I'll just focus on this one.
Internet speed has nothing to do with bitcoin confirmation speed.
Confirmation time depends on the number of transactions in the mempool and then, if multiple confirmations are required on the time between blocks.
Now, your theory is exactly the opposite of reality.
Chinese miners where actually in favor of big blocks and its big blocks have a problem with internet speed, ff the block is 1GB and your upload speed is just 10Mb then you have one hell of a problem
But, as I said Bitmain is promoting BCH so they are not concerned about internet speeds.