I have a client that wants a reddit post removed from SERPs

I am willing to split the proceeds of the deal. I have not yet negotiated a deal because i dont know if its possible to accomplish what he wants, but I know they have the money and are highly motivated.

They are looking to get a reddit post thats very negative removed.

They've tried reporting it etc but no luck. If anyone has some ideas to deindex or derank offending post, ideally completely, ping me and we can make some money.