I'm not sure what your point is here or how it is relevant to superchargers on I-26. We have 9 locations in South Carolina, with at least 1 more (this one) under construction. Of the most recently completed, 3 were constructed in the last 12 months (Fair Play, North Charleston, and Hilton Head), and a fourth was just about 14 months ago. Zero are on I-26.
IMO, the best thing that could be done to help EV charging deployments is to work on permitting and regulatory reform.
However, unless there is something unique to I-26 that is causing it to be harder, its hard for me to see how permitting and red tape are the things that make them pick I-95, I-85, I-77, and I-20 in South Carolina over I-26.