It is a longmenpai form, I am not extensively knowledgeable on the history. On its conceptual face I disagree with "setting" the spine, but perhaps there is a minor misunderstanding - stasis extrapolated equals death. This form has sequences of openings and closings of the spinal joints starting with things like crane neck, turtle neck, but in addition to the longitudinal openings&closings there are lateral openings and closings; the form corrects and straightens via these openings and closings and also contains work for the hips, knees, and ankles as well. It is very good at correcting issues caused by too much sitting, ostensibly 'what it was designed for' in terms of spiritual cultivation; the literal translation along the lines of connecting the heavenly vehicle with the earthly one.
I think the zhineng level 2 is available online in pictureword description, it is similar, though I have never been shown the "second-level" of the longmenpai form to have much basis for comparison.
Anyway, doing this form regularly has made my spine pretty mobile, it gets worked and adjusted daily...but then again I have back injuries, previous surgery, etc, so its imperative that I'm diligent otherwise it begins to tighten up. I did a couple sessions at a chiro before when I had a tightness or two that I was having a little difficulty overcoming, and with those couple adjustment-tricks I learned plus the qigong forms that I do, I am able to completely self-maintain
One of the best investments I've ever made, honestly speaking.