Is the Digest of Literary Research sponsored by China Renmin University a core periodical?
I'm not sure what you're talking about. I didn't find this publication on HowNet. General authoritative core journals (Peking University Core and Nantah Core) will be published on HowNet, which is also the minimum standard. If the core you are talking about is the two I am talking about, then this journal is definitely not a core journal.