Nope. Any crypto you can break with a real, physical, non-imaginary quantum computer, you can break faster with classical. Get over it. Shor's don't run yet and probably never will.
You are misdirecting and you know it. I don't even need to discredit that paper. Other people have done it for me already.
This is incorrect. Whilst you may be sceptical about whether quantum computers can be realised, the theoretical result is sound.
Recent advances in quantum error correction are a significant increase in confidence that quantum computers are practical.
We can argue about timelines. I suspect it is too early for startups to be raising funds for quantum computers at this stage.
Source: I worked in quantum computing research.