This is illogical! You raised the alarm and if the evidence is needed you must provide it. You intrude into their profile for reasons best known to you while also you are aware that whatever they choose to do with their account is none of your business. Just like our other social media platforms, we delete posts/images we no longer find interesting and get rid of them with or without reason and the same is applicable here. Moreover, deleted posts here can be obtained on the ninja site in case it is evidence against them they're trying to get rid of.

If they're doing it maybe for the reason stated in your original post, then it will affect their rank as well since ranks work in hand with activity and I don't think anyone who is after the signature campaign (since you mentioned the campaign manager in your post) will prefer to have less activity with less rank since the higher the rank the higher the payment. You deserve an accolade for the research after all.