If you look at the sources more closely, you'll see the "70%" figure was the number of wild boars that have measurably higher levels of radioactivity. Not the number above the limit.
This has been a big thing for the Hunters association since the limits are very low and fallout was very localized, hunters in some areas are very much affected since they could not sell the meat.
It's a pity, since even Livsmedelsverket themselves say 1.5 kBq/kg is safe to eat several times a month[1]. The limits are set very low. Granted, they state above 10 kBq/kg should not be eaten, but there were very few animals above that value.
[1] https://www.livsmedelsverket.se/livsmedel-och-innehall/oonsk...