Blocking a user on Discord prevents them from:
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Sending you new Direct Messages (they’ll receive a generic error message if they try).
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Sending you a friend request.
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@mentioning or “pinging” you in a server (you won’t receive a notification).
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Adding reactions to your messages.
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Seeing certain profile details like your “About Me” section or activity status.
Blocking the person on Discord DOES NOT delete your old messages.
If you want to delete your old messages, you have to use Redact (how to remove old messages in bulk) or delete your old messages one by one using the official discord delete method.
Hope this helps!