Nothing worse than a CEO who does not understand how their business works at the lowest level. Unless this somehow does not matter for business profitability or future (which there are examples of but much less than many people would think).
In my experience, upper management has this problem of getting accurate information. This happens for many reasons and is really, really, really hard to fix. It usually requires conscious, serious and sustained effort from the manager demonstrating his/her people that it is safe to bring information whether good or bad.
I bet the a shift once a month is good investment of time as long as he won't be placed in a bubble -- a model Starbucks location where everything works perfectly because the CEO works there once a month.