Does PoE Ninja and PoB not calculate Detonate Dead correctly?

I was looking at trying a Detonate Dead build and I was looking at some PoB's etc and PoE Ninja. I was looking at some delve builds with 800 depth that only had 60-70k DPS? And these guys are wearing Mageblood and Gloves of the High Templar, so they got top-end gear on. That can't be right, is it? How can anyone be doing so low DPS and be at a depth of 800 that that kind of gear? But then I looked at a YouTuber whose PoB says over 10 million. Why are these numbers so wildly different.

it scales with mob life? no clue how it's calculated though

For one thing, it usually calculates one explosion, when this is an AOE skill and many top builds use awakened spell cascade. (So multiply by 5 there.)

I believe POB calculates spell damage correctly, which not everyone scales. For spell damage builds, you obviously want +spell damage, gem levels, fire damage, etc.

Other builds focus on the corpse explosion, which is not impacted by spell damage or gem levels. You want fire damage and the right spectres here.

I dont think PoB accurately calcs the corpse explosion, because it cant determine which corpse you are blowing up.

They could also be doing corpse explosion ignites, which would make the hit very small.

TLDR - POB works well for spell damage focused DD, but not high-life spectre corpse explosion DD

There certainly is a variety of builds for this. The PoB with a 10mil DPS, of course, is very high-end gear and it's an ignite build.