I think you are misconstruing here, correct me but I think the loudmouth said put on trial (which could be various communication made with malice, libel or defamation, ) and then Section 124A of the 1860 penal code, outlaws expression that can cause “hatred or contempt, or excites or attempts to excite disaffection,” but did not say treason specifically. He said terrorist sympathizers should be on trial, it's a suggestion made to his panelists and viewers by him. The government did not take him seriously.
BTW on a different topic, NDTV did report out sensitive classified drills operation of nuclear sub. If anything that should be something for which there should have been a probe of why NDTV got out classified information and published it without clearance.
And irrespective, he has not named Barkha, if Barkha is the name that pops out when it comes to Pro-Pakistan Psuedo Secular, then maybe there is more to know here.
And why are Journalists above questioning, if Ministers are corrupt and attempt to excite disaffection, there is no problem when Arnab calls them out to be put under trial, same for corrupt bureaucrats and businessman, no one cries foul there. Now here is a journalist who actively tags a Hizbul Mujhahideen Commander as "Poster boy of Kashmir jihad", for three days the news in NDTV - Oh look at the terrible horrible government in the center that HSC topper becomes a terrorist, headmasters son picked up a gun, budding cricketer now has picked u weapons.... Arnab's show is opinionated, his opinion is such yellow journalism seems to have a well defined agenda behind it, and should be put on trial.
I may not agree to what he is saying, but he has the right to put his opinion forward just like JNU's students have say "Har ghar se Afzal Nikelega", JNU professor has the right to say "40% of India is under military occupation and Kashmir is illegaly occupied by Indian Armed forces" and Barkha has the right call Burhan Wani as "Poster boy of kashmir Jihad" - Why have different yardsticks , freedom of speech protections not just meant for jhola chaap left wing puppies