Of course it was typed by a secretary. At a computer company I worked at starting in the mid 1980s it was not unheard of for some execs to have their admins print out emails for them and type in the handwritten responses. This was an internal-only system. No external email.
I know many old lawyers who still can’t type. They have admin staff (and junior solicitors) to draft correspondence for them.
They also charge enough for their services, as senior partners of big firms for it to make no sense for them to do their own typing.
As of 2010 it was not unheard of for old civil engineers to have their secretary print all email and maps, they would redline them, and the response would be typed or scanned as appropriate.
Being a touch typist was seen as kind of blue collar until everyone could afford personal computers at home..
Never learned to touch type. I can type pretty quickly but never took a course. Same with shorthand.