I don’t know why they say “a”; surely it should be “more”? :o)
I find that just the act of making the coffee achieves the same aim. Today I was sorting stuff to take to landfill (the tip, as it’s known in the UK), and before I started I put the kettle on. Before I loaded the car I reboiled the kettle and made coffee. When I got back from the tip, I realised I hadn’t drunk the coffee and it was cold.
That’s pretty typical for me: I make it but don’t always finish it, but in the making I’m procaffeinating!
It reminds me of another quote I’ve heard:
Never put off till tomorrow what you can put off altogether
Not forgetting this one either…