I think its worth pointing out that the FDA typically allows a +-10% margin of error with injectable pharmaceuticals, and on top of that HPLC testing can have an error range of up to 5%.
It's highly unlikely primal purposely under dosed just their primo 200 to save a little bit of raws lmao, otherwise they wouldn't have lowered the primo200's price. I'd be willing to bet it was testing MoE not falling in their favor, and if people were to send in blind samples I'm sure we'd see testing come in much closer to 200mg/ml.