Apparently that's the claim, at least per this Wired article titled Bitcoin’s Creator Satoshi Nakamoto Is Probably This Unknown Australian Genius:

There’s also a PDF authored by Kleiman, who died in April of 2013, in which he agrees to take control of a trust fund, codenamed the "Tulip Trust," containing 1.1 million bitcoins. The PDF is signed with Kleiman’s PGP signature, a cryptographic technique that ensures it couldn’t have been altered post-signature.

Yeah cause Satoshi used law firms and not cryptography to secure his bitcoin... what a joke. In the podcast, @aantonop discusses how scammers use appeals to authority to overcome doubt (since they cannot use appeals to cryptography, of course). Craig Wright takes appeals to authority to an extreme with his "wheelbarrow of degrees" stunt: