The file size shown in the Info popup has nothing to do with whether a database is fully or shallowly synced.
It is reporting the aggregate size of the items found in the database, not the size of the database package itself.
Note the file clearly shows it’s 812.5Kb and it’s shallowly synced, evidenced by the cloud icon in the details but also the link to download in the view/edit pane.
So this file has not been downloaded into the database and yet, what does the Info popup report? 812.5Kb
The only thing I see wrong here is the visual artifact where On demand is active yet the switch doesn’t appear to show that state. (And this is a new, never before used or sync database, only syncing to DEVONthink To Go via Bonjour.) @eboehnisch ?