Before getting too judgmental about this "reformer," I suggest looking up the punishments in vogue in much of Christendom at the time, even in the "advanced countries."
The Spanish Inquisition was burning heretics, and witches were being burned in Scotland.
In England, starving children were hanged for stealing a loaf of bread.
In New York City, a teenage girl girl was hanged for stealing the shoe buckles of another girl.
The true scandal is that the Saudi regime hasn't moved on from this period.
I note that the author doesn't have much to say about what we should do about this regime.
Islam does not get a pass just because the Christian world's behavior 500 years ago. [I know you know this:)]