My guess (since they mention using agencies, but never an in-house designer): They bought this either as a template or as a contract gig, it was delivered with

My guess (since they mention using agencies, but never an in-house designer): They bought this either as a template or as a contract gig, it was delivered with the expectation that they swap the demo social links out for the real ones, and the people on the receiving end just never looked that hard at it.