https://www.merriam-webster.com/dictionary/advise meaning 2: to give information or notice to : INFORM

An advisory gives notice and/or warns about something, and may give recommendations on possible actions (but doesn’t have to).

Words have multiple meanings depending on context, and here it's at best ambiguous. In the context of security incidents, logging, auditing, etc., "advisory" is often used as a severity level (and one of the lower ones at that).

So, yes, technically, it's de-facto advisory to publish this information, but assigning "advisory" as a severity tag here is questionable.