I think the article author managed to balance the feeling of gratefulness towards the person for their contributions, while obviously perceiving that person's worldview as unfathomable in comparison to their own.
In that situation, what other choice did the author have? Lie (by omission)? I respect the fact that the author chose to be honest instead.
And I think people should appreciate that choice or at least understand it without dismissing it as some kind of character assassination or rudeness.
An ever increasing number of people nowadays seem to be very much guilty of the same things the author mentioned in their post (the black and white worldview), it's not exclusive to deeply religious or conservative people. It very much exists on the "other side" as well. They will usually cite their own favorite pieces of dogmatic gospel (e.g. the "paradox of tolerance") to justify dismissing a person outright, based on some "incompatible" worldview or statement.
The author, however, didn't resort to this. As someone who obviously has no insight into what the article describes, to me it still absolutely comes across as balanced.