And I see strong similarities between the style of "Old Bob Job" and of "PhD
teacher"

There are definitely not the same person.
Old BJ has the ability to write well, but chooses to use a rustic narrative voice. He occasionally slips and uses complex language structures.
PhD Teacher is unable to write correctly, fails to recognize literary references, and misconstrues arguments. He is likely a native language speaker without a college education.
Why Old BJ tries to emulate the writing of the FTs that 'hang out' with him on this board is puzzling. People that silently 'amuse' themselves at the expense of others usually lack social skills and have familial psychological issues.