What did Lewis Wolpert mean when he stated that ‘reliable scientific knowledge is value-free and has no moral or ethical value’ (p. 1254)?

Answer 1

He meant exactly what he said. This is perfectly understandable English that isn't in some kind of coded or obscure terminology. If you do not understand the words, consult a dictionary. 

Answer 2

He saying scientific law is greater than God law. Science oppose the idea God can do all things

Answer 3

If I lay out particle science concepts, they have no value ethically. If, however, I am tampering with biology, ethical concerns are apt to emerge -- something Wolpert didn't include in this hypotheses.