I can do a lot of things asynchronously. Like, I'm running the dishwasher AND the washing machine for laundry at the same time. I consider those things not occurring at "the same time" as they're independent of one another. If I stood and watched one finish before starting the other, they'd be a kind of synchronous situation.
But, I also "don't care". I think of things being organized concurrently by the fact that I've got an outermost orchestration of asynchronous tasks. There's a kind of governance of independent processes, and my outermost thread is what turns the asynchronous into the concurrent.
Put another way. I don't give a hoot what's going on with your appliances in your house. In a sense they're not synchronized with my schedule, so they're asynchronous, but not so much "concurrent".
So I think of "concurrency" as "organized asynchronous processes".
Does that make sense?
Ah, also neither asynchronous nor concurrent mean they're happening at the same time... That's parallelism, and not the same thing as either one.
Ok, now I'll read the article lol