We should definitely not trust CZ because he said Binance.US is an independent entity then he ran it as a subsidiary. That's a pretty solid lie and also solidly explained in the article.
An independent entity operating as an exchange might do market making activities with many other exchanges. It seems Binance.US only does that with Binance.
An independent entity operating as an exchange should be directly responsible for and in possession of customer funds that have been deposited with them. Binance.US couldn't fulfill withdrawals without Binance's help. That should not ever be necessary if these are separate entities.
An independent entity operating as an exchange might do market making activities with many other exchanges. It seems Binance.US only does that with Binance.
An independent entity operating as an exchange should be directly responsible for and in possession of customer funds that have been deposited with them. Binance.US couldn't fulfill withdrawals without Binance's help. That should not ever be necessary if these are separate entities.