I got a message from Google that my iPhone is infected with 30 viruses

All such messages are scams from criminals. Close the offending page, and avoid sites that are involved in such bogus advertising tactics.

It is a PHISHING SCAM. Unless your iPhone is jailbroken, it can't be infected with a virus. This is an attempt to get your identity and money.

Delete it and DO NOT provide any information.

See this link --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support