I'm an ex Adventist born in, now an Anglican. I would say the items in the book by Dale Razcliff have not been used in my lifetime to discipline members.
I can agree with some of Dale's theology but I believe he overstepped with saying the church uses those tactics today. There are theological issues I would have a problem with and had a problem with when I was a member and I can say I wasn't backward in expressing those opinions such as Historicism the belief in the day =year and the historical implications. Also the investigative judgment issue the only SDA contribution to theology.
I have raised these issues many time in church bible study meetings and have never been disciplined. I do respect the SDAs for there tolerance but then there are many divisions and it would be impossible to control such a diverse range of opinions.
Some Advents don't believe the trinity and support ministries that agree with there stands on this , There is a group which are perfectionists called the LGT [last generation theology ] which I believe the president of the General conference is a member, There is the Concerned brethren group who which believe in going to war and retain many of the original doctrines, the liberals in the SDAs believe in womens ordination and don't believe in going to war, many are evangelicals and believe very much the same as evangelicals as in other denominations.
My list could go on but is an example of the large tent of SDA opinions .