This is correct. Using epic as an end user (pharmacist, nurse, doc) for clinical duties and being certified are very different. One does not need to be 'certified' in order to use epic in this manner. Being certified in an Epic application allows one to build it out and customize it to your organization's specifications. I went through both willow and beacon (oncology) certs, which are not difficult at all but do take a bit of time seeing as how you must travel to epic HQ and sit in their classes on their schedule (their HQ is really cool tho, reminds me of a super modern college campus... they make it pretty painless) ; the certifications only give you the most basic knowledge of manipulating the system. The rest is learned from colleagues over time. One must be sponsored from a healthcare organization or approved consulting firm in order to get certification. Epic is the most anal about getting certified in their programs and how the hospitals use them compared to the other EHR vendors, which is probably why they are quickly becoming the most common EHR in the large facilities imo.
Getting into the field would likely be very difficult without a hospital background, but I would still apply for every informatics job out there if you were interested, in addition to hospital jobs... Could get lucky. As for new grads, it would be close to impossible unless the director was your family or something.