No, they host all the data locally, but the website front-end was through AWS.
“We will likely be down longer than expected,” wrote Matze. “This is not due to software restrictions — we have our software and everyone’s data ready to go. Rather it’s that Amazon’s, Google’s and Apple’s statements to the press about dropping our access has caused most of our other vendors to drop their support for us as well.”
Could have swore that's I heard said on Bannon's WARROOM Pandemic show this morning. But I was listening while doing other things. So I must have misinterpreted what was actually said. That's what I get for trying to multi-task. 8>)