Way past senior engineer, not sure how git/ssh acrobatics is less complex in your mind than "fly deploy" or clicking a button in render/vercel/etc. Premade github actions / gitlab / all exist for these things and the author would be paying less money for a more robust deployment process. DIY with tools that aren't meant for the job isn't better because you already use git/ssh.

Author is running gunicorn/flask/nginx, this is trivial for a buildpack and would take like 5-10 minutes tops to set up a robust build/deploy flow with any recent PaaS.