Do we know that for a fact? You described them as a "web development consultant", but I couldn't tell for certain what their exact role on this project was. Their services page (https://www.nicchan.me/services/) lists both "Web Application front-ends" and "translate your designs into a scalable system", so I think they offer a range.
> "translate your designs into a scalable system
To be fair telling customers to f** off when they want to reach out for help scales infinitely
Both of those sound like expertise in building a website, and not like expertise in business strategy.
To be clear, I would personally have a similar view to the author here. I'm just surprised that they think their opinion on the strategy side matters so much to their client!