Dunno. What Ajahn Brahm said is: Ajahn Brahm cannot enter Jhanas, Ajahn Brahm has to disappear for Jhanas to happen.
Also the hot air balloon analogy: Throw out everything, even the basket to get higher, once everything is gone, you see that you’re still hanging onto the balloon, let even you go, then it goes all the way up.
Seriously, it’s all in his retreat talks, go listen to them. Again and again. Especially during lockdowns, you can do home self retreat.