Fuel supplier, yes. Aircraft operator, yes too.
And "fuel supplier" is a bit unfair, for the rapidly expanding, and now, publicly quoted company (Canada and Nigeria), is into a very wide range of oil businesses. What's lacking for now, is a refinery, but I won't be surprised if they add one soon.
As for aviation, they fly two Hawker 800s. I don't know the facts but the operation is as well suited for South African management as scores others, in Nigeria. That means Execujet, NAC or other new operators from SA