That article isn't really advocating handling _all_ errors as values AFAICS - it just doesn't distinguish between _exceptional_ and _normal but unsuccessful_ paths.
For a wrapper around an HTTP transport, returning HTTP responses instead of raising an exception for stuff like "403 Forbidden" is probably reasonable. Their own example code is full of exceptions, though.
@FinishingDutch @ahornsirup
But Wikipedia aren't charging people to see the work you contributed for free. That's a significant difference.