As a developer, I would say that private cheats are nothing but a selling point for uneducated people. Unless you are into flexing you have access to a private cheat, you are better off with a long time undetected cheat that is public. A public cheat that can stay public with mass amounts of people, is wayyy more secure then a private cheat. The general thing I notice is inexperienced devs, selling their products as private because the lack of confidence in their product. If you are going to go with a private cheat, go with one like hackmachine. He has been in scene for years before tarkov (the game itself), was a thing and has extremely good history
I would highly recommend staying away from any cheat that does not have a active user count over 20 - 25. Under these numbers, battleye does not go aggressive on your cheat and will let people pass with semi detected cheats just for data gathering purposes