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Re:Show HN: SocialAmnesia – Open-source tool that auto-erase... by throwawaymath on Wednesday March 27, 2019 @04:54PM (#19505926)
Unfortunately it's not actually possible to delete reddit comments from being publicly searchable. There are several independent projects which continuously retrieve and store every single comment. For example, PushShift[1] constantly crawls reddit for all new comments and posts. Their entire corpus of historical data is freely available for download. There is even a free service to search through any user's entire comment and submission history[2]. This includes deleted comments and deleted users.

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1. https://pushshift.io/

2. http://redditsearch.io/

Re:Show HN: SocialAmnesia – Open-source tool that auto-erase... by oftenwrong on Wednesday March 27, 2019 @05:18PM (#19506126)
That only matters as long as those services are alive and people bother to keep the data.
Re:Show HN: SocialAmnesia – Open-source tool that auto-erase... by StellarTabi on Wednesday March 27, 2019 @05:59PM (#19506552)
The pushshift data sets are downloadable.
Re:Show HN: SocialAmnesia – Open-source tool that auto-erase... by lstodd on Wednesday March 27, 2019 @05:41PM (#19506358)
So, basically forever. Services may come and go, but someone will have the data.