Hello.
Similarly, this zone should carry the tag on the name as (Level 100 - Hardcore Heritage) which makes more sense as it's not a "revamp", it's hardcore heritage and is only available a month of the year.
This is a special revamped, higher level version of Castle Mistmoore released during The Broken Mirror expansion. It is available during special events (usually branded as "Hardcore Heritage",
occurring over several weeks in the spring and/or summer).
Outside of special events, the zone is otherwise in its regular state.