Nice headline. A 2 kiloton rock would destroy most of the planet.
A 2.1 kiloton explosion would not make much of a dent.
There is a BIG difference.
Barringer crater was a nickel iron of about 300,000 tons mass. It was about 20Mt yield. A 2000 ton rock would be pretty spectacular to see but not much to write home about impact and geology wise...