Easy guide.
Load into leviathan.
Go to castellum
Find phalanx (there are 2)
Shoot crit on shield to charge the 5th shot.
Shoot any other full health cabal in their critical hit spot. (1 charged shot will damage the cabal enough to kill it with the burn).
Repeat 50x.
After that kill the remaining 400+ enemies you need to kill.
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That reddit post is not as detailed as above. @MONKEYMAN507 gives a more concise strategy than the thread. I discovered exactly the same thing - shoot the Phalanx shields 4 times then shoot a full health Legionnaire in the head which takes them to about 10% where they then die from the after burn, not the explosion. I also took my Leviathan boots off so I wasn't getting the extra 15% damage bonus on energy weapon kills, which made it more consistent. Otherwise, with "Energized" procing, the crit shot would kill them outright.