I think this report misses a trick that Alireza used.
The report calls it "surprising" that he paused after two games and then came back later with an amazing 12-game win streak. But we also see that most of his opponents on that win streak were sub-2500 players. When he comes back later on, he is low in the standings, he gets some easy opponents, and he can build a streak. Since arenas reward streaks more than regular wins, he can sometimes get more points by skipping some early matches and then coming back later to sweep through the low bracket.
Probably this tactic of starting late is very common among the top players here.
The report calls it "surprising" that he paused after two games and then came back later with an amazing 12-game win streak. But we also see that most of his opponents on that win streak were sub-2500 players. When he comes back later on, he is low in the standings, he gets some easy opponents, and he can build a streak. Since arenas reward streaks more than regular wins, he can sometimes get more points by skipping some early matches and then coming back later to sweep through the low bracket.
Probably this tactic of starting late is very common among the top players here.