I saw this: poison spark pathfinder using original sin

POBBin: https://pobb.in/Lpc0xX_UvcP2

youtube: https://www.youtube.com/watch?v=Nsh_gQHqvC0&t=329s

i'm not actually sure why it's supposed to be tanky (is this just progenesis scaling?) and why it has apparentlly such high damage?

defense: 65% phys taken as ele., nature's patience, arctic armour, max res., progenesis, leech, life gain on hit (thought you would need more phys taken as)

damage: only 2.3m ..?

builder claims in notes that damage is way higher than shown because of ramping poison. can someone explain how to show the correct damage? calc sheet just shows poison DPS and maximum number of poison stacks. is the builder just referring to how spark naturally functions (i.e., additional hits)? damage seems quite low in any case ...

i really like the idea of this build, but not sure if it's actually good or bait