Full Idea
Einstein's general relativity included Newton's theory as a special case: Newton's theory corresponds to the speed of light being infinite relative to the speed of the interacting bodies.
Gist of Idea
Newton is a special case of Einstein's general theory, with an infinite speed of light
Source
report of Albert Einstein (works [1915]) by Frank Close - Theories of Everything 5 'Gravity'
Book Reference
Close,Frank: 'Theories of Everything' [Profile Books 2017], p.97
A Reaction
So Newton's theory was NOT wrong, but he made the false assumption that the speed of light was infinite.