I think it's a pretty reasonable assumption, even if the ordering is strictly personal (some people would take a job with better work-life balance instead of the better paying one, some would make a different choice, same thing with technology stacks etc.).
The second premise also seems to be true, though I would phrase it in a descriptive rather than prescriptive manners - the choices you make regarding job offers reveal your preferences ("the ordering of jobs").
Having no "job ordering" would result in people taking jobs based on a coin flip, wouldn't it?
- there is an ordering between jobs
- one’s goal is to find the “highest” according to that ordering
I don’t think that either of those is true in my value system.