You're using the exact same logic as those that were using child labour for coal mining in the 1800s.
They're being specifically exploited because that is what the company set out to do. You could argue any number of benefits as a smokescreen but the reality is that they hired people in Kenya because they knew they could exploit them. Everything else is post-hoc rationalization.
The wages they're paying are substantially higher than all the local averages. This is a good thing.
How is this "severely exploiting"?
The alternative is that the Kenyan economy remain isolated, small, and impoverished. This is a bad thing.