TLS 1.3 doesn't change that, you can still MITM connections using your own root CA certificate installed on users' devices. Not quite sure what you're arguing against here.
I disagree with the premise your newsletter on two counts:
1. that you are perpetuating this misuse of "crypto" to mean "cryptocurrency", when there is already a long history of "crypto" being an abbreviation of "cryptography"
2. that you are encouraging people to gamble their money on cryptocurrencies, which are rife with scams and fraud and unsubstantiated grandiose claims