As @RaheemKassam and others have explained, Ferguson is not "running" from his original projection. His prediction is *in his original paper*
21,000 is the projected death figure if the UK implements the measures which it now has.
h/t, again, to @RaheemKassam.
imperial.ac.uk/media/imperial…
But that doesn't mean it's right to say that the modeler is "running away" from his prediction, when he's got the receipts to prove otherwise.