There's an awful lot of handwaving in this blog post. I'm sorry, but I'm not convinced. The author mentions how some devices that can seemingly solve exponential time complexity problems also require exponentially high precision, but there doesn't seem to be a strong argument for why that doesn't apply to quantum computers. We haven't experimentally demonstrated quantum computing at sufficient scales to prove that the required number of physical
qubits to perform error correction doesn't scale exponentially.