I´ve got the same questions as o-maps and I tried to find the original study online - hopefully in a language I could understand. No hits on Google though and that may be telling us that it´s published in Japanese?
The Swedish text and the Google translation correspond pretty well, nothing is missing or has been made into something else. Since I couldn´t find the original study I can only hope the Swedish text I have read depicts matters correctly.
On a similar note - there was a major motor cycle race
organized in Sweden earlier this fall. They had over 2300 starters and I found it very strange that they were even allowed to go through with it at all considering the temporary restrictions on the number of people allowed to gather in one place. The answer to that is that they were doing this on private land (military ground) that doesn´t have to follow the same rules and the police had no say on the matter. Very strange all the same!!
A later report
say that at the time of the report (two weeks ago) only one case of covid had been found related to GGN locally, but the total number may never be known since people were coming from all over Sweden.