Serverless Database, Global Latency 2.8 ms, Relational but no SQL (whatever sense that makes) BULLSHIT BINGO at its very best.
One way to handle it when something strikes you as not correct is to politely ask for clarification.
Their claim is that you can run an application distributed in a cloud around the world with data in their database, and read queries to their database will get results in an average of 2.8 ms.
This puts a lot of caveats on that 2.8 ms claim, and makes it something that is both good and believable. Which makes the claim very much not bullshit.