I understand the need to provide some kind of indemnity in the context of a pandemic. But it should have come with strings attached.
i.e. develop a vaccine that uses proven methods if possible (e.g. inactivated whole virus vaccines) that will not result in controversy and low uptake. If this were not possible/advisable, a clear explanation should have been provided plus the rationale for the method selected.
Otherwise pharmaceutical companies get carte blanche to potentially benefit hugely from this crisis. They are enabled to test their whimsical (and possibly-dangerous) products on the population without bearing any of the risks. And they can use the trial process for future patents as well.