It would be an enlightenment to pose the question to the guy concerned. But more than likely, he just pitches at what he thinks is o.k., not having absolute pitch, and not being aware that what he's doing may not be the best.
We had a director of music in the county I taught in, and he would always sing falsetto when leading choirs, in the strange belief that because the pre-pubescent children's voices had not broken, they wouldn't be able to sing in another octave. Personally, I've never found that to be a problem - people naturally sing in whatever octave they find comfortable, even jumping the octave when a note is uncomfortably high or low, due to a small range, usually. Frequently, if I felt that the key didn't suit the singers, I'd change it, so everyone was happy.
I remember being at a school during singing practice, (not as the music teacher), and the music teacher was teaching a song that had quite a high range. He asked what should they do to reach the high notes, and suggested shoulders back, etc. I very nearly interrupted to suggest 'drop the key', but didn't...