[dastbe]

No need to be uncertain, the article outlines this pretty clearly:

"Behind the scenes, DynamoDB implements multi-master writes and ensures that the last write to a particular item prevails. When you use Global Tables, each item will include a timestamp attribute representing the time of the most recent write. Updates are propagated to other Regions asynchronously via DynamoDB Streams and are typically complete within one second"

In terms of access you're still touching a regional table, and while you can make use of things like conditional expressions they are limited to the regional table's view of the data.