I didn't get that assumption from the article at all. (Unless you meant "on HN" instead?) To me, the article's focus on permanently deleting old messages speci

I didn't get that assumption from the article at all. (Unless you meant "on HN" instead?) To me, the article's focus on permanently deleting old messages specifically avoids that error - it's not about avoiding disclosure but as defense-in-depth since disclosure is always a possibility. Beyond that, avoiding Slack (even with data deletion) is unlikely to increase security, but it does decrease priority for smaller users who might be swept up in an attack on Slack in general.