Reporting the draft wouldn’t be unusual.Has to be overall length as well otherwise the numbers don't work out. Don't think navies usually report actual draft either. That allows guesstimating hydrodynamic details that no one but specialists care about. If it is a real image, it's probably just navigational draft like the US gives.
The US Naval Vessel Register records key dimensional parameters of US surface combatants, including draft limit. Publicizing the draft is I think required for a vessel to safely visit foreign ports.