Correct. The original writer was probably confused by the
fact that the materials ceramic ICs are made of can contain
radioactive materials that can cause errors.

No, the alphas from lead are a real problem. Ten years ago, there were
folks going round to churches with lead roofs, offering them a new lead
roof in exchange for their old--and now low-alpha--lead ones.

But where is the lead /within/ ICs? (The wires are bonded, not soldered.)
Alpha particles have poor penetrating power.