And how do you know????
The leap second claim is wrong.
How do I know? I don't remember if it was an astronomy course or something I picked up later, but the earth is not slowing by a second a year or anything close to that. A check of the web suggests that the earth's rotation is slowing at a rate of about 0.005 seconds per year.
The leap second is done to adjust our calendar to the actual rotation of the earth.
And this makes the article nonsense.