Er, so the guy claims he's run quantum computer algorithms on an "ordinary cell phone". That's literally, physically impossible. Quantum computing isn't a new way of writing code or something stupid like that, it's a physical abstraction of quantum entanglement that allows you to solve certain, very specific problems. Like prime factorisation, which if scaled up, *could* break RSA (and current-generation elliptic-curve cryptography too).
Seems and smells like a nutter. Maybe I'm wrong, but a LinkedIn post is not really where you put these things. Where's the paper? Where's the proof of concept? Go on then, create a signed Alphabet, Inc. certificate against your domain. I bet he can't.