Good catch. Cross Posts are technically posts on the chain. I will see what I can do to ensure that these are filtered out. I don't cross post much (if at all) - so I did not see this come up when I was testing my own data. This will make the tool even more accurate :)

Working on a solution now, which will likely be "If duplicate titles, de-deuplicate by retaining the earliest (oldest) post, with the highest word count... (Probably using the perm link)

I'll use your account to test my fixes further :D