We cannot expect people we are attempting to lead/coach to do a task if we do not demonstrate that we know how to do it. It's like having a personal trainer who is a couch potato, it simply makes no sense!
I really hope that other "tech leads" are not following this example! Put in the hours you expect others to work. Document your work the way expect others to. Write tested, maintainable & performant code as you wish others to. This is all leading by example!