Yeah, interesting! I agree I don't usually hear macro used that way.
But if someone was microing a battle and as a result didn't look at the minimap and see a drop arriving at their base, I can totally see concluding that this player is bad at macro as a result -- macro is referring to there being a macro cycle of tasks you have to perform all the time whether you want to or not, and non-production tasks like checking the minimap and sending in a scout seem like good examples of those tasks too.
Exactly! Macro is everything "big picture" -- being aware of the overall state of the game, managing all resources involved (including attention, APM, time, mindspace), and grand decision-making ("I'm up against X overall strategy. How should I respond? What are the weaknesses in my approach? What should I be looking for that would exploit those weaknesses? How can I address those situations?")
Execution of the answers to those thoughts is in the form of tactics and micro, the other two aspects of macro. If you're following current SC2 pro meta, a "strong macro player" however has more right answers to most of those questions (Stats, Innovation) and that's their strength, versus a "strong tactical player" (TY, sOs) or a "strong micro-based player" (ByuN, herO).
But if someone was microing a battle and as a result didn't look at the minimap and see a drop arriving at their base, I can totally see concluding that this player is bad at macro as a result -- macro is referring to there being a macro cycle of tasks you have to perform all the time whether you want to or not, and non-production tasks like checking the minimap and sending in a scout seem like good examples of those tasks too.