The pilot mentioned was a technical pilot, not a test pilot. So he was a pilot with additional duties of writing and verifying checklists and manuals, and vend

The pilot mentioned was a technical pilot, not a test pilot. So he was a pilot with additional duties of writing and verifying checklists and manuals, and vendor and client meetings. He would also do acceptance testing, like the MCAS sim test. There could be several of these. A test pilot is a whole level (world actually) beyond that, with an extra $1-2 million in training (hence almost always ex-military) and assigned to major aircraft development programs. Usually only 1 or 2 are assigned to a development program.