From the article:
The participants are listed here in the order of registration:
- The united team of Japan Universities
- Moscow State University
- University of Missouri
- University of New South Wales
- University College London
- Harvard University
- Princeton University
- University of Toronto
- Saint Louis University (two teams)
- University of Oxford
- Nankai University of China (Host team)
So, 11 teams. For an all-play-all that would require 11 rounds where one team has a bye in each round.
The article goes on to say:
The tournament will use the Berg's counter-attack system, and will be
ranked after eleven rounds in five days.
So, yes, 11 rounds. The standard way of pairing such a tournament would be to use the Berger tables. The FIDE Arbiters Commission publishes an Arbiter's Handbook which, amongst a lot of other information, includes a section which lists the Berger pairing tables for various numbers of players. The table for 11 or 12 players is given on page 66:
11 or 12 players:
Rd 1: 1-12, 2-11, 3-10, 4-9, 5-8, 6-7.
Rd 2: 12-7, 8-6, 9-5, 10-4, 11-3, 1-2.
Rd 3: 2-12, 3-1, 4-11, 5-10, 6-9, 7-8.
Rd 4: 12-8, 9-7, 10-6, 11-5, 1-4, 2-3.
Rd 5: 3-12, 4-2, 5-1, 6-11, 7-10, 8-9.
Rd 6: 12-9, 10-8, 11-7, 1-6, 2-5, 3-4.
Rd 7: 4-12, 5-3, 6-2, 7-1, 8-11, 9-10.
Rd 8: 12-10, 11-9, 1-8, 2-7, 3-6, 4-5.
Rd 9: 5-12, 6-4, 7-3, 8-2, 9-1, 10-11.
Rd 10: 12-11, 1-10, 2-9, 3-8, 4-7, 5-6.
Rd 11: 6-12, 7-5, 8-4, 9-3, 10-2, 11-1.
"Berg's counter-attack system" looks like a 3rd rate Google translation. I susupect this article was given to chessbase and they included it without any checking. It is not "Berg's counter-attack system" it should be "Berger pairing table".