I feel like I must point this out, but no one is arguing that "jobs that have negative economic value" would somehow exist.
> Do I have evidence that employers will have to eliminate jobs if the position doesn't create enough value to cover the wage?
This is actually not at all what my second point was asking... The ask was, if we assume for a minute that a $15 minimum wage simply eliminates jobs (as opposed to bringing extracted employee value more in line with employee compensation and reducing employer profits), whether eliminating the jobs that cannot pay $15/hour would actually increase unemployment in such a meaningful way as to offset the potential benefits it would offer... The context being that we, as a society, have already decided that the benefits of eliminating (see assumption above) $5/hour jobs was worth whatever effect it had on unemployment.
With this is mind, it's obvious that QFC closing two stores is completely meaningless because it provides nothing close to an objective view on A) the effect on overall unemployment, nor B) the positive or negative effects it had on the employees whose jobs (according to QFC) were eliminated. That's not even to mention the fact that QFC has a vested interest in blaming regulation, or the fact that a single anecdote is not at all representative of the job market.
I'll just also add that it's very hard not to take what you're saying as simply constructing a straw man (as opposed to misreading or misunderstanding), given how completely unrelated anything you wrote was to my other comment.