There was a comment asking what an "IC" was, but the comment was flagged and now dead. Guessing by the context, I'm pretty sure it means "individual contributor", or "person that is not a manager".
I've only ever seen it to mean "individual contributor", but then this would make it odd/bad advice. There should only be 1 "customer". Sure, that customer may have a whole team that actually needs the product, and may provide them for clarification or what not, but to avoid unrecorded/incorrect handshake agreements, specs, or pet requirements that have nothing to do with the initial product ordered there should only be 1 POC for the product unless otherwise specified.