It probably does as the ORF archives do not make anything available unless it was hosted on Austrian soil. Home VCRs were available from 76/77-ish so most likely someone just taped them.
the quality of these old analogue derived recordings seems to be a direct function of how many 'generations' away from the original tapes they are. some of the tapes from this era that i have seen look to be no more than 1 or 2 generations away from the ORF masters, although, ironically, an old betamax machine from the early 80's can prodce a better image than a later vhs machine, which complicates matters.don't have first hand knowledge of home recording in the late 70's so i cant comment on the quality, presumably not a great deal different.
so whilst they could be derived from old home recordings. those are usually given away by some sort of continuity announcement (or adverts on commercial channels). was/is ORF a commercial station and would coverage of a GP during this era have had 'ad' breaks?
there are a few spots on the swedish broadcast where the tape does a typical analogue 'woopsie' as the signal seems to drop away, and a continuity announcer on the start , before the king starts to do his 'king' bit in a tour of the circuit, which might lend some weight to that one being a home recording.
but i'd lay money on quite a few of these tapes having been recorded directly from the masters, whether or not the official line is that nothing is avaliable from the ORF archive. who was it who said that borrowing is theft without a court case afterwards.?