I spent many years on this forum, and there were always offers to buy fake reviews. I am sure that there are currently other similar active services on the forum. Some attract attention, some don't.. We cannot deal with this because it is not only on the Bitcointalk forum, and it is a general problem on all similar platforms like Trustpilot, Google reviews, etc...
The only two options we have here are zero tolerance (it worked with mixers), or deleting all such posts or leaving them as is.
Only what I am waiting for since morning is a PM that my post has been deleted by the person that created the topic. If that happened, I will give the user a negative feedback because he wants to give fake review on Trustpilot for people that paid him or because I mentioned people to use escrow which he may not like for him not to successfully complete his exit scam.
Even 10 negative tags mean nothing here. A newbie account with 4 posts is insignificant, and it takes very little time to create a new one like that. Someone who decided to buy reviews from him, the negative tag will certainly not deter him from doing so.