The ECHR was set up by world leaders, including Churchill, after WW2, to ensure that atrocities, such as the Holocaust, couldn't happen again.
Human Rights Protection was enshrined in International Law, so that governments couldn't just do as they might choose to, if it was without due regard to human rights.
It seems the ECHR stopped this flight, primarily, because we have no mechanism to return those already sent to Rwanda, if our Judicial `Review, due at the end of July, deems it illegal.
So, future flights, or not, will have to wait until after that.
Then, the whole thing should be settled, legally, once and for all.