Chatted with Dodge Support, not sure how reliable they are, and this is what they said:
You sir, are a champion! I got confused because on the Challengers it looks like it is further up front but it’s not, it’s just that the door hole is much bigger on a Challenger and the B-pillar hides the lumbar on the Chargers. Ok, going to go hide in my hole. 🙃 Sheesh! 🤦♂️😬The lumbar adjustment is further back on the seat from the seat adjustment controls. I believe in your first vid you can barely glimpse the circle of the adjustment for a split second. Here is mine on my 2021 Charger Redeye for reference:
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