“He would suffer no harm from his statement otherwise since he committed no crime.”
A liberal federal prosecutor could view it as a Terrorist Theat and a liberal federal judge could issue a search warrant for his house.
During that search they may find, fuel oil, fertilizers, nails, a pressure cooker, a rice cooker, timing devices and assorted firearms.
A Grand Jury would indict.
He would not be convicted at trial, but would have a lawyer bill of $200k.
Ah, a little sauce of foolishness to go with your straw man.
Seriously though, these statements may be used to impeach him if an appropriate legal occasion arose. Or his employer.