This is done intentionally as a joke. Yoko Taro just wanted to make Kainé look and sound vulgar without changing the rating of the game from D to Z plus he wanted to use the beep from the moment he settled on Kainé's character. "I tried to do it with 'beep' from the beginning," said Taro in an interview with Game Watch "Also, I've never seen a beeping sound in a serious game, so I wanted to try it once."
Even in the Japanese text you'll find that the swears are written in gibberish just like when you arrive at Mask town for the 1st time. It was written like that from the start. It wasn't written with swears in mind then got censored.
The link to the interview
[ Ссылка ]
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