Just find the whole concept of this question odd.
Nobody rational questions that what Moyes did initially was tremendous and he deserves all the credit in the world for his first five or so years here. He worked wonders.
However, he then proceeded to tread water and preserve his own reputation and further the notion of "plucky little Everton" instead of meaningfully try and push on after that.
So no, nothing that has happened recently changes those facts in hindsight. Moyes was both brilliant and lacklustre, depending on what part of his tenure you look at. The failure of Martinez and Koeman doesn't impact Moyes' failure - it simply means Martinez and Koeman were failures too.
To be blunt, the last good manager we had David Moyes, circa 2008. Since then we've had three bad managers, including Moyes from 2008 onward.