Because the company has seen significant expansion of work, all command-ready copilots now have their commands. Because recruitment was frozen for a few years, the next lot down have only been in the company for about 2 years max and just don't have anything like the total hours required by the oil companies for commanders.
So I don't think its bad management, unless you think it would be good managment to recruit a bunch of pilots during the hard times just so that if/when the boom comes you have more command ready copilots. That would be more like a recipe for bankrupcy.
With Bristow split up into its business units there is far less of the sort of thing that SAS and SP refer to. This advert is paid for by European business unit, for pilots to join that unit. Nigeria can do its own advertising!