// If that nightmare scenario happens and Professor Ferguson's figures don't bear scrutiny (again) his career should be over. //
Under what sort of scrutiny? The real world is, to an extent, always going to put any given model to shame, but that isn't a cause to destroy a scientist's career. The definition of a model is something that only attempts to capture, rather than succeeds in capturing, reality. Ferguson et al's projections essentially presented a nightmare choice. Risk him being right, or risk him being wrong, neither seems entirely palatable. The appropriate scrutiny is not what hindsight teaches us but whether his modelling seemed reasonable at the time.
I'm absolutely disgusted at his poor judgement all-round in seeing his lover during the lockdown his modelling led to, but I'm not sure what it has to do with his scientific work, as some elsewhere seem to have implied.