Doesn't look like an official video. Anyway, and just for the fun of finding details for the identification:
• The 928 was unveiled for the 1978 model year, and apparently saw no body change until 1980 in Europe, when spoilers appeared (but only for some models);
• The car has French plates from the Hauts-de-Seine department (number 92), for which 1979 plate numbers are 2196 HC 92 to 253 HX 92. 39 HL 92 place this registration number more or less in the middle of the year, giving the car a late 1979 MY... if it is its very first registration. But it also means that this car can't be newer.

⇒ 1978-79 model?

For the record, Walk All Over You is the 3rd track of the album Highway to Hell, released in July 1979. If I'm not mistaken, the guy dancing on the frozen lake is Bon Scott, who died in February 1980. So this video was obviously shot just a few weeks/months before his death. Certainly in December 1979, when the band filmed Let There Be Rock in Paris, near... the Hauts-de-Seine department.

So is this video the official release shown in Let There Be Rock, or is it just a video montage made from rushes?
_____

If official, and if the IMPDb also works on video clips: some biplanes are used in this video.