Earlier quoted context omitted.
The Southern Poverty Law Center is a sadly similar story. They're downright extreme nowadays.
An example being SPLC labeling ex-muslims as hateful "islamophobes".
Why is that an example? Plenty of ex-whatever-religion (or even ex-particular-denomination) people turn right into the most extreme and hateful bigots against the group they departed.
It’s a frequently commented on phenomenon among religious people, often not focussing on betrayal by departing members (where the bias of attachment to their own identity group might make them prone to overperceive) but on the trend among converts to their own religion.
It would be weird if a group tracking hateful religious bigots systematically excluded former members of the targeted religious group from the label.