The last news from IBM on HN about their quantum offering was that they had optimised the memory required for simulating quantum computers. 50-qubits seemed to the the upper limit before, but they managed to simulate a 56-qubit circuit. It was a good read: https://arxiv.org/abs/1710.05867

They've had real hardware for a while, though, and they have 5-qubit and 16-qubit machines that anyone can try via IBM Q experience.

So this is 100% legit as far as I'm concerned.