Aside from his abysmal spelling and grammar, English is mother tongue, there are a few other anomalies.
That is an irrelevant quality to being a pilot - professional or otherwise. If that's all you are basing things on then it doesn't prove things one way or another.
The acid test is what he knows about the company he claims to fly for, and his detailed knowledge of operating their aircraft.
It wouldn't be too difficult for readers here to draw up suitable questions if we had the details of who he 'flys' for and what he 'flys'.