There were two matches here:
1. the rugby match and more importantly
2. the match for a Top 6 world ranking where Argentina came in with a 15-0 lead.
When it was 21-0 in the former match, Scotland were leading 5-0 in the latter.
You could see the activity and fervour with Contemponi and his crew at that point. This had little to do with the 21-0 score line.
Argentina massively attacked Scotland to defend their Rankings position. The actual match then became winable once the rankings match was put to bed.