Disregard the study? It is a systematic review and meta-analysis. Here are the conclusions:

“There was no prospective association between lumbar spine flexion when lifting and the development of significantly disabling low back pain. There was no difference in peak lumbar flexion during lifting between people with and without LBP. Current advice to avoid lumbar flexion during lifting to reduce low back pain risk is not evidence based.”

Increased load does not mean it is a harmful load. Squating and walking down a hill increases the load on knee joints but we don't avoid it. Furthermore, out bodies adapt to load and strain, increasing resilience through thickening of tissue. Some reserach even shows flexed postures may reduce shear force and increase spine stability (https://pubmed.ncbi.nlm.nih.gov/16319750/)

A correlation - the NPR article - is not causation. That is the case across the board with studies that support the postural model.

The study about disc height is a brief change in water content. Disc height diminshes with standing throughout the day. They increase when we sleep. They decrease with age as well. Furthermore, MRI findings - herniations, athritis, degeneration - have no causal relationship to pain.

Research does not support hyperkyphosis is an issue. Sit it whichever posture is comfortable to you, just don't sit all day long ( I think we can agree on that point).

It's not about finding one study to validate a point, rather, it is about looking at the breadth of the literature. That is where systematic reviews and meta-analyses come into play. According to the current state of research. Posture does not cause pain.