After Patch 10.1.5 launched, players have noticed that Mythic Zskarn is not casting Unstable Embers — significantly decreasing the difficulty of the encounter. This has now been fixed.
One of the main mechanics on Mythic Zskarn is Unstable Embers which deals high damage to 4 players but when the debuff expires, it fires a line towards them Elimination Protocol. Without Unstable Embers, there is also no Elimination Protocol which significantly reduces the throughput required to defeat the encounter.
Realistically, the only unavoidable raid damage left on this encounter is Blast Wave and Tank damage. You can see an example log from tonight which has absolutely no Unstable Embers or Elimination Protocol damage.
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