Could you ask here all the question you would like to get answered, it will be easier? “Cleansing kamma” does not lead to Nibbana but better rebirth so there is no way you can attain Nibbana like this. You can easily cheat other people who do not know anything about Buddha Dhamma into believing anything you want just triggering for them some special experiences to manipulate them by doing that. This is why most “spiritual” communities are dangerous places to be as inside most of those communities are rotten besides some people who actually do good in the world.
If you are into discord you can join and practice with us on discord too https://discord.com/invite/g6UWq4b