Strategy is the ideas that guide test design Logistics is the ideas that guide the application of resources to fulfilling the strategy Plan is the ideas that guide the test project
If we look outside our little testing bubble, there is a big difference. A strategy is part analysis, part decision, and big-picture actions. See the book “Good Strategy Bad Strategy” by Rumelt but also other business books. A strategy is about WHY and direction.
A plan is a work breakdown structure: do this, do that, do this first - then this other thing. Tasks on a user story are also a plan. A checklist is a plan.
Automation strategy is why - Automation plan is what.