This is a statement from Wikipedia How to identify reliable source" 
"Blogs" in this context refers to personal and group blogs. Some news outlets host interactive columns they call blogs, and these may be acceptable as sources so long as the writers are professional journalists or are professionals in the field on which they write and the blog is subject to the news outlet's full editorial control. Posts left by readers may never be used as sources''

That website is of ex-BKs so they have lots of information about BK. 

Even though authors will of course add some biased content into their books, they are considered reliable. 

I did not use the comments in the website. I used the information in home page's about', in which it explains what Brahma Kumaris is.