ふたつのアカウントを付け替えてしまい、プレステーションのデータが消えてしまいました

そして日本語への翻訳ミスにより付け替えていいものだと思っていました。

日本語訳では10月26日以降に新しく作成されたアカウントは対象外だと書かれていました

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And yes, if you made a secondary account for Apex Legends after October 26th, that account isn't eligible for cross progression.

Hey there, 

Locking the thread down here as it's in a language we don't currently support on Answers HQ.

Please feel free to use one of the contact options listed above, or check out our Cross Progression info below for more information on that subject.

A Quick Guide to Apex Legends Cross Progression - Answer HQ (ea.com)

Now that Cross Progression is here: what you need to know - Answer HQ (ea.com)