FWIW - there is a thing called a "Repairman" certificate per FAR 65.103 and a completely different thing called a "Repairman - Experimental Aircraft Builder" certificate per FAR 65.104 - R-103 and R-104 for short.
R-103 certificates are common in repair station environments. The IA is correct in this sense - a holder of the R-103 (but not a R-104) cannot do a condition inspection. The next level certificate (Mechanic with A&P) can do the condition inspection.
If one holds the R-104 per 65.104, the sole privilege of that certificate is to do the condition inspection on a specific make/model/serial number aircraft. Specifically - see
http://www.ecfr.gov/cgi-bin/text-idx..._1104&rgn=div8. The ability to do the condition inspection with the R-104 is absolutely clear from the regulation.
The problem may stem from tossing around the term "Repairman" somewhat interchangeably - the term can apply to two completely different certificates with radically different privileges.
Dan