So the newspost doesn't say this explicitly but the issue we were fixing was that if you were at 15 hp for example you'd always take 13 damage and not die because damage is capped to your current hitpoints BEFORE the relic effect activates.
We can't really do the relic reduction first without going into almost every offending monster script and fix it accordingly so this is the result of that.
In most cases it won't affect anyone, the tank a jad hit task can still be done anyway with just having high hp or tick-eating