That is what the story from the Spanish mercenary is saying. Here are some more excerpts from an English translation:

He specifies that the figure depends enormously on the qualification and the task, “they do not pay the same to a paramedic as to a sniper. Or a drone pilot than a zafador or an artificer.” Then there are the “pluses”. “In my case, it’s $300 per man killed . . .”

Since I act alone, I am ground gold to them. If you don’t need anyone, it’s cheaper, of course. And on top of that, in my case, with good marksmanship confirmed at 1,600 meters. They asked me why I hadn’t come before." So far, he has not met any other snipers: “We are very few. We make more casualties than anyone else after artillery. Then there are those who pilot the drones, which are in high demand. It’s mind-blowing what they do.”