I don't think I can take seriously in this context a quote in which certificates (a type of public document) are also designated "secrets". Like, sure, they're

I don't think I can take seriously in this context a quote in which certificates (a type of public document) are also designated "secrets". Like, sure, they're probably thinking of PKCS#12 files which actually have the private key inside them, not just the certificate, but when they are this sloppy of course they're going to use the wrong words.