Since you cant delete your account here, and deleting posts manually one by one is a pain, i made a python script to automatically delete all posts that can be deleted, and to edit those which can only be edited (changes subject and message to "x")
I couldnt find any terms of service for this website, so not sure if this is even allowed.
The delete option I think is allowed but editing all posts and changing it to just X or anything I think it should be not allowed because if someone finds your tool I'm sure they will take advantage of using it to spam links.
People who perform SEO spam most likely already have their own tool which have capability to edit post, so i wouldn't worry too much about people people misusing OP's script.
and the forum also has archives where deleted files can also be seen and traced.
Which forum archive you're talking about? At very least, i know
https://bitcointalk.org/modlog.php doesn't log post deleted by it's owner.