Wrong.
There might have been an occasional case when the lines centered perfectly, but it was a function of the number of letters per line. With three lines, this is almost impossible to be mathematically perfect on a typewriter. I know. I used to do that. "Visually" centered, but not mathematically.
Exactly. Remember going to the center and then backspacing to try and get everything centered? And, if you had an odd number of letters it was never perfect! Now I'm showing my age...LOL