I didn’t read everything, but I mostly agree with the author, especially on this point:

While you can definitely abuse exceptions, functional-style error values are not a one-size-fits-all solution.

There are time and place for both. I think exceptions are good for bigger errors. Like database connection errors. Things that shouldn’t happen without any easy backup plan. Those errors might need to be escalated as high as possible where proper action can be made (like resetting the database connection and everything relying on it).

Functional style is great for smaller stuff. Like key not found in hash maps. In many cases there might be good defaults that can be used instead.