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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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a = [[1], [2], [3]]
b = [[1], [2], [3], [4]]
(a & b).size # 3
a.size # 3
a = [[1], [2], [3]]
b = [[1], [2], [3], [1]]
(a & b).size # 3
a.size # 3
But a is not the same as b.
Technically this is a Kihon (a strike, where as a Kata is a series of movements) - but since Codewars ranks each Kata with a Kyu level and 8 Kyu is for beginners, it just uses Kata and not the term Kihon. To your point, at some point in the future it might be nice to separate the challenges out into the 2 distinct concepts, but for now there is no issue here with simplicity.
Yeah, but that's not really an issue, though.
This is VERY simple kata.
If kata is close to katana, then this task is closer to knife)