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A live-stream gamer on YouTube wrote this sentence on his video description
that normally goes beneath the video when you click 'Show more...' .

> ロックマン10をクリアしたのですが、9の時にワイリー土下座が9回あった理由の回収です。

Google translate:

> I cleared Rockman 10. It is the recovery of the reason why Wily Dogeza was 9
> times at 9.

I think he is trying to say, "I've already beaten MegaMan 10, but I'm gonna
re-discover the reason as to why Wily was defeated 9 times so far in this 9th
MegaMan game."
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question
grammar meaning
What does 理由の回収 mean? Is this a set expression or phrase or what?
> ((9の時にワイリー土下座が9回あった)理由の)回収です。

It seems to me your question is about the relative clause inside that sentence
which may have clouded your understanding of the sentence. I hope partitioning
the sentence this way helps clears it up for you.

  * 9の時にワイリー土下座が9回あった modifies 理由, and tells us what that reason is, namely answers the why question
  * 9の時にワイリー土下座が9回あった理由 modifies 回収 and tells us the whole reason is a reason for the 回収

You can also use ため here to explain the reason: 9の時にワイリー土下座が9回あったための回収

Without more context it's hard for me to tell what 回収 here means. I'm also not
sure why [dogeza](https://en.wikipedia.org/wiki/Dogeza) is mentioned.
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answer
回収 in a context like this refers to
[payoff](https://backtothefuture.fandom.com/wiki/Setup_and_payoff), the act of
giving an answer to a previous foreshadowing/mystery. 伏線を回収する is a common set
phrase meaning "to pay off the foreshadowing".
[フラグ](https://japanese.stackexchange.com/q/2061/5010)を回収する is also common.
理由を回収する is not really a common set phrase, but can be understood in the same
manner.

  * 9の時にワイリー土下座が9回あった理由  
the reason why Wily's _dogeza_ appeared 9 times in Mega Man 9

  * ～の回収です。  
This is the payoff (part) about ～.  
This (scene/video) finally explains ～.
CC BY-SA 4.0
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answer