If you broaden your scope to your entire life, one part of your life strategy might be to succeed at your job in order to feel pride in your work and economically support support other aspects of your life. In that scope, designing a good marketing strategy would be a tactical consideration in implementing your life strategy.
Hm. Is it okay to write that, then not go on to describe the difference?
The right strategy makes tactics work better. The right strategy puts less pressure on executing your tactics perfectly.
I think what the author was getting at is that a todo list is simply that: a list of tasks. It doesn't really capture why you're doing those tasks. If you just take jobs as they're handed to you, you're not strategizing. You're turning yourself into an automaton.