It’s in the link posted above, under PVP Settings overhaul. Quoting it here for visibility.
Temperature, balancing and PVP changes coming with the release of Isle of Siptah
We have also added a new system called Dynamic Building Damage, which if enabled (server setting) allows player to damaged buildings while any of the owners (individual or clan) are online (even outside the scheduled raid times) and for a duration (server settings) after the last owner has logged off.
While these settings are completely customizable in private servers, on officials we will introduce the following changes:PVE and PVE-C Official PC
On official PvP servers
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