When you click the link and look in the upper right corner it reads "unknown" - meaning the source of the listing is unknown. So it is difficult to determine who posted it. Probably an individual rather than a Realtor- but who is to know?
My best advice is to contact a local lic SC Realtor to search the property address in the MLS.
I'd look it up, but work out of a different MLS area.
Search the Charleston MLS: