That's why I have stopped taking statements (here) seriously, unless and until they are backed with some official data . Bloggers often make statements which is far from reality.
Yes SV deserves a dedicated daily train for Delhi. Vaishali, Bihar Sampark Kranti, Purabiya etc every Delhi bound train gets major chunk of passengers from there. SHC being the administrative HQ of Kosi Division of Bihar witness major rush of passengers from that region. There was no daily Delhi bound train from that region before it's extension. Tier 2, Tier 3 cities of Bihar guarantee good amount of passengers for Delhi, Mumbai, Surat, Bengaluru etc thanks to migration.