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sunnuntai marraskuu 18 - 22:26 Yes he is sure. It doesn't matter how many teams you have as each round one team plays with team from lower league. Only league that can loose some games is lowest one. You can see that here:
https://rockingsoccer.com/hr/soccer/help/home/category-12/article-42
As for last sentence, only if u21 team is closed after the draw is made it is possible to play less games. For now you can see you all played 22 same like we in league 1.
Since missions were introduced every league has 32 games for u21 league.