I'm not convinced that those deletion tools work on Reddit either; there's nothing stopping Reddit (or whatever site you're trying to scrub) from restoring your edits (which they've done to lots of people recently) or even just viewing the older version of your comment that is still present in their database without publicly showing that text.

Just because you've used some script that claims to scrub your data doesn't mean it did so. At most you may have toggled an is_deleted=true flag, or added another edit entry to the table your original comment was stored in, but that doesn't mean nobody has your data anymore.

The only way to be sure nobody can ever see your post history is to never make posts in the first place.