“It is what he’s saying” is subjective. A quote is not (or shouldn’t be, despite far too many violations in the real world). Just say “Summary: blah blah” if you want to post your subjective summary.
You already write why that is mathematically impossible, so the logical conclusion would be that it is not meant to be interpreted like that no? Language is not maths, no risk doesn't mean the risk is zero. It means the risk is unlikely.
These are complicated topics. The people buying crypto at Coinbase are not sophisticated investors.
It is entirely reasonable to believe that a large proportion of Coinbase users would read, "We have no risk of bankruptcy" and choose to leave their money at Coinbase believing that the CEO must have used some financial mechanism to 100% prevent bankruptcy.
Words have meaning, and when you say, "no risk of bankruptcy" there are a lot of people that will be duped into believing that literally.