The welcome message should be disabled and removed outright if it cannot store in the site’s database which users have dismissed it.
My browser is set to clear all data on close, but this happens with every page load. My LocalStorage thingy can’t be clearing out after every page load surely… and my cookies don’t either, even though not relevant to this case (and of course if cookies were clearing then I wouldn’t say logged in).
Personally just feel like this welcome thingy has been badly implemented and would prefer maybe an admin panel widget or something that lets someone open it themselves. It should offer a tutorial rather than shove it in my face if it’s closure isn’t being stored in a database, in my opinion.