I watched that game (both the Algeria upset of W Germany and the W Germany/Austria game, actually). It was back when PBS would show next day edited versions of the WC games in '82 - they would edit full games down to an hour program.
Not ready to say Austria and the Germans conspired ahead of time, but once the Germans scored, there definitely seemed to be some unspoken wink/wink, nudge/nudge action going on.