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So, I have a link report from Link Detox. And I'm going through all of them and considering what sites need to be removed. and trying to find emails and contact webmasters.  There is just one odd thing i'm starting to see more of.  A lot of links are on websites or webpages that no longer exist. The link no longer exists. Some of the domains are even available for purchase. Why are these links showing on the backlink report and are they really harming my website?  Also, do I need to add these links into the disavow document that I will submit to Google?

My company is conducting a link detox for a client, and it seems like every tool we utilize is giving us a different answer on how many links we actually have.  the numbers range anywhere from 4,000 to 200,000. Does anyone have any suggestions as to what tools will give us an accurate count, and will also email the webmasters on your behalf requesting the links removal?  We are trying to have this process be as automated as possible to save time on our end.