can potentially be interpreted as commercial solicitation under TCPA.

I'm no lawyer, but the federal TCPA's wording is similar.

(4) The term “telephone solicitation” means the initiation of a telephone call or message for the purpose of encouraging the purchase or rental of, or investment in, property, goods, or services, which is transmitted to any person, but such term does not include a call or message (A) to any person with that person's prior express invitation or permission, (B) to any person with whom the caller has an established business relationship, or (C) by a tax exempt nonprofit organization.

(5) The term “unsolicited advertisement” means any material advertising the commercial availability or quality of any property, goods, or services which is transmitted to any person without that person's prior express invitation or permission, in writing or otherwise.

I guess you could try to stretch it to say you're encouraging them to facilitate his purchase of property, but that doesn't seem to be the intent IMHO. Maybe you could make an argument that he's advertising that currency is a good that's available to them?

If someone wanted to go after him, and he did use the phone system. Maybe obscene/harassing call statutes work better.

makes a telephone call or utilizes a telecommunications device, whether or not conversation or communication ensues, without disclosing his identity and with intent to abuse, threaten, or harass any specific person;

Like you say, his self-professed intent is causing panic.