You can't get data in RTI in one day or IR entertain for one day simple answer will be no data vailable.
He must have complied data from IRCTC charts and availablity after chart prepartion. He has not mentioned Bolpur boarding data so the difference in NJP might include boarding at Bolpur. In IRCTC sometimes it doesn't show shrt distance in current availability after chart preperation.
Yesterday in Uday had lot of current availability but didint show in BZA Vskp upto RJY but RjY to Vskp it showed 493.