I'm not sure what you're trying to point out, but it seems like the data was stolen from a third party DoorDash uses, and that they only had data from users that registered on or before April 5, 2018. The breach actually happened on May 4, 2019.
(And the 2015 reference in the comment you're replying to is about a Flipboard breach, not DoorDash)
Well, back in 2018, TechCrunch reported that they were compromised. I believe this is the same breach as then. They just reported it one year later.