Not too sure about that. Looks like it is doing exactly what I said.
The front part of the canrds (in front of the movable surface) are fixed and the rear drop like flaps to hold the nose up, but not for pitch control. Here is a video:
The canard doesn't move like an elevator when it taxis, and once it is retracted, it never seems to move at all. The tailerons seem to control pitch in-flight, with the canard seeming to me to move only like flaps when in landing configuration.
You don't seriously think he taxis and flies around at lower speeds in landing configuation with the stick locked full aft, do you? If he did, how would he control pitch? Watch a video of a Typhoon or a Gripen, and the canard only moves for pitch, and can be seen moving around near touchdown when small pitch changes are required. Every time I have seen a Viggen fly, the trailing edges of the canard never move except either in trail or full down (nose up). The only time they seem to be between those points is when they are lowered or raised during the takeoff / landing sequence.
Here''s a quote from Air Vectors:
"The wing had a somewhat complicated form, designed as a double delta with something of a "hoop skirt" appearance in planform, and a dogtooth on each outer span. The dogtooth was added to improve longitudinal stability when carrying external stores. Each dogtooth was further marked by a bullet fairing for a radar warning receiver (RWR) antenna. There were two-section hydraulically actuated elevons on the trailing edge of each wing.
The canards directed turbulent airflow over the main wing at low speeds, lowering the stall speed on landings. They had no dihedral and were fixed at a few degrees of incidence, but had trailing-edge flaps to improve takeoff performance. The canards on the first prototype had a noticeable dihedral as the aircraft was initially rolled out, but the dihedral was eliminated before the machine took to the air. The tailfin was fixed, with a one-piece rudder. The tailfin folded to the left to allow the aircraft to be stowed in hardened shelters at field bases. There was a fixed ventral fin under the tail."
And here's the clicher concerning computers, another quote from Air Vectors:
"The control layout was analog, as would be expected of aircraft of its period, but featured a Svenska Radio / Ericsson (SRA) head-up display (HUD) for primary flight data, including displays generated by the instrument landing system to help guide the aircraft down. The most significant element in the AJ 37's avionics suite was its Ericsson PS-37A monopulse X-band radar, which was primarily focused on air-to-ground and navigation, though it had limited air-to-air capabilities. The rest of the avionics was impressive -- or at least it was for its era ..."
You can read the whole thing here: http://www.airvectors.net/avvig.html