I'm against permanently "flipping the bozo bit" on any source, and yes, the grandparent post's pure-shunning against-the-person is both unhelpful and corrosive.
But there's a case to be made that the extent of Hari's prior dramatic fabrications still hasn't been recognized, and that he still tends to embellish details in more recent work:
http://www.jeremy-duns.com/blog/2014/9/7/kdgwxcbsned1rknh0h3...
(For me, a compelling excerpt from his book a few months ago – https://news.ycombinator.com/item?id=8919880 – seemed vague and jumbled on timelines enough for me to wonder about the trustworthiness of Hari as a narrator... even though I'm naturally sympathetic to criticisms of the drug war and drug-warriors.)
As wrong as it is to say Hari "is" inherently something bad, it should be fair to remind the unaware of what he once-upon-a-time did via his reporting, and that those who are conservative with their trust may still want to take his most poignant reporting with a grain of salt.