I think there is a distinction to be made between "paleo" and "mitochondriac". Dr. Kruse is one of the leading thinkers in the latter category and I think calling his arguments "paleo" and then attacking those is unfair. They are not paleo and based on your reply, no offense, but I see that you misunderstand his arguments greatly.
His arguments are focused more on mammalian evolution (rather than human DNA), caused by rapid changes in the environment, not random mutations over long timelines. 65 million years ago, the POMC protein allowed us to survive the KT event. The mammals that were hiding from Dinosaurs underground, were now exposed to the sun (after few years) and that caused a lot of changes in the ways their genes expressed and we, Humans are the result.
The basic thesis: The light environment is the most important. Mammals are able to use light to replicate photosynthesis inside them, thus creating glucose and insulin, thus not needing as much food (check POMC cleavage products). That's what allowed those mammals to survive and thrive in this new predator-free world. We now changed our light environment so dramatically and so quickly, that our biology can't keep up. Blue light raises blood sugar and insulin without any sugar intake. Diabetes is an evolutionary response to the amount of blue light we are receiving. This is why chemistry (food, supplements) is not as important as light, water, magnetism.
RE: UV light in the forest.
I don't know how much evolutionary time we spent in forests vs. savannas but I would bet much, much more in savannas exposed to sun most of the time. The other variable is temperature, see next point.
RE: Inuits
Yes, this is actually part of Kruse's argument. Light and temperature are inversely correlated, the less light you have the more you should expose yourself to cold. I'm pretty sure an African man would be cold in Alaska in the exact same clothes his Inuit friend is wearing. In other words, the Inuit is cold adapted, his mitochondria work differently.
RE: Evolutionary goals arguments
I don't dispute these. But I'm not sure whether they are germane to what we are discussing here.
RE: paleo environment vs. technology
Kruse is not against technology, he is against technology abuse. He is saying, don't abuse technology, and if you use it, make sure you counter the damage by spending time in nature, grounding, exposing yourself to sunlight, drinking clean water, etc. Or, yes I agree, if you want to go further, you can start biohacking with lamps, grounding sheets, etc. However, Sun is TINA!
RE: sloppy thinking
I don't quite get this. I thought physics is first principles and quantum effects are part of physics. We know they work, our computers are based on them.
Overall, I think you have almost an emotional response, maybe you are used to understanding things right away, since you are a very bright person. However, his thesis are stretching the limits of what we are able to understand in more than one area of science. That might be the reason his arguments sound like a word salad to you. I am taking the time and studying for more than 2 years now what he has to say and I find it more and more fascinating.
If you are open minded and humble enough to give it a go, I suggest this podcast: https://open.spotify.com/episode/1dzpuyYNN1yHNgiiGVfFBO?si=d2ad5b605f9e48dd
He builds up the thesis from basics in a non-argumentative way.
Have a great day :-)