Your older forums weren't even in the public_html folder so the statement by your host is crap.
The only thing I can think of is that you had forumrunner enabled whilst not updating it to the latest version, it was vulnerable to something that allowed people to take over your forum.
I recommend upgrading your forum to the latest version and change the password of all administrator accounts.
Of course, it's still entirely possible that the hacker left a backdoor somewhere in your files, plugins or datastore cache.
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