You mean, even if I live a stellar life and am revered as a saint, after I die I won't be able to pray for those who revere me?
It means precisely that. Nothing more to do ever in the things that go on under the sun.. is as exclusive as it gets. Nothing more - ever. Means you can't be involved here unless you sprout a living body again and pop back on earth. And that is so whether you end up in heaven or hell. Communicating with the dead is outlawed in every form in the Old testament. For someone to pray to you would be a sin. This is pretty basic stuff. It hasn't changed in Judaism. They all know it's a sin. How is it you don't?