You’re comparing them linearly, a comparison for which the statement is false.

The statement is true multiplicatively/logarithmically/unitarily.

Atomic radius is ~ 1e-10m

Light second is ~3e8m

As a ratio, your height can be measured as 1.8e10 atomic radii, and a light second can be measured using only 1.7e8 humans who are 1.8m tall.

Does that help?