The isolated phrase "spinning a signal in a circle" is confusing, but the accompanying visualization of tracking a point on a spinning speaker cone is something that can be visualized.
More generally, your explanation may make sense to you, but it makes no sense to a layperson (i.e. me). But the linked short description, along with the speaker cone visualization, does make a reasonable amount of sense.
I've also seen a similar description in the past with accompanying animated GIFs illustrating the point, instead of the prose about a spinning speaker cone. I thought the animated GIFs made it even easier to understand. Sadly, I don't remember where I saw that.
More generally, your explanation may make sense to you, but it makes no sense to a layperson (i.e. me). But the linked short description, along with the speaker cone visualization, does make a reasonable amount of sense.
I've also seen a similar description in the past with accompanying animated GIFs illustrating the point, instead of the prose about a spinning speaker cone. I thought the animated GIFs made it even easier to understand. Sadly, I don't remember where I saw that.