People can question the trial design all they want but we already have approval from the MHRA, the FDA and other such regulators.
Sure, they had approvals to change the trial IND. That means the RAs felt the change was safe and ethical for patients.
The RAs said nothing about the change being suitable for approval. The vast majority of trials are not for approval. If NWBO wanted to salvage some hypothesis forming data from the trial, why should the RAs stop them?