I'm pretty sure he knows what Doordash is. I assume the thing that doesn't exist is ordering via a phone line, not an internet-based interface.
i.e. texting or calling a number in a specific way based on some standard tons of fast food places provide to make fast food orders without human interaction.
It still seems pretty disingenuous to say it doesn't exist even today just because we do the same thing with better tech today - very likely what their hypothetical company would've ended up doing, same as Netflix or Twitter embracing the technology for their use cases and moving away from DVDs and SMS.
I really think he's trying to pussyfoot around his poorly-aged claim by changing the goalpost. Even in 2005, with Domino's order tracker, it was still a purposely-contrarian stance on what technology would allow us to do with food ordering in the near future. If this is considered a hill to die on, that's embarrassing.
i.e. texting or calling a number in a specific way based on some standard tons of fast food places provide to make fast food orders without human interaction.