No Deal is the plan even if the EU suddenly drops the backstop. Boris's team wouldn't know what to do if the EU did that, any way. Their assumption is that crashing out will force the EU to renegotiate on their terms.
I don’t know if they realise how stupid that is. “We are leaving without a deal so you will have to renegotiate with us” is not a strong hand. It’s a fucking idiots hand.
Boris Johnson has no intention of renegotiating Brexit deal, EU told
https://www.theguardian.com/politics/2019/aug/05/no-deal-brexit-is-boris-johnsons-central-scenario-eu-told
No Deal is the plan even if the EU suddenly drops the backstop. Boris's team wouldn't know what to do if the EU did that, any way. Their assumption is that crashing out will force the EU to renegotiate on their terms.