You are right but the admin on the site class her as such.

The ships built for the New Zealand conference Lines carried general cargo outwards and both reefer, chilled and some general cargo when required homeward.

So they were in fact general cargo ships with refrigerated space,however admin have a case as most of the ships sold for further trading actually were used as pure reefers.

Not a reefer built 1980 onwards.
This was a general cargo vessel built in 1962 at John Brown's yard, Clydebank. Launched 30/7/1962.
She was designed for the carriage of Refrigerated and general cargo. She had 12,716m³ of insulated cargo space and 1,992m³ space for general cargo.
Chilled meat lockers were fitted, port and starboard, in Nos. 2,3 and 4 upper 'tween decks, and two tanks, suitable for liquid cargoes, including tallow, were fitted forward in No.1 hold.
At the forward end of No. 2 hold was an electrically operated Velle Shipshape crane, replacing two conventional derricks. It had a capacity of 10 tons, and was supposed to operate as a high-speed crane for its time. Luffing and slewing was enabled by a single bight of wire rope.
Propulsion was an 8-cyl Brown-Sulzer RD 76 super-charged diesel, developing 9,750 shaft horse power on a single screw, producing 16.5 knots. This was the first of the new design Sulzer engines to have been built by the marine engineering department of John Brown.
Ships of this time and type were not referred to as reefers in their day. Most commonly called refrigerated cargo liners.
Source: "Evening News", Dunedin, NZ newspaper, 11/8/1965 in a weekly shipping column by Doug Wright, a late contributor of many photos to this site and maritime historian.