Please provide the citation, complete with source, where Anthony Flew complains that the theory of evolution doesn't "explain the origins of the Universe."
If he has in fact made such an absurd complaint, senility would be as plausible an explanation as any. But I seriously doubt that he has.
Try to understand this: evolutionary science does not address questions about the origins of abiotic nature, or even of life. It explains certain features of life on this planet, notably how it has changed and diversified over time. It is not a theory of everything and does not aim to be one.
I will be waiting for the citation from Professor Flew.
Could it be that their explanations have changed because their conclusions have been found to be incorrect?
Just asking....