No, James Gunn has said that only parts of "The Suicide Squad" is canon but definitely NOT the "entire" movie.Pretty much that entire movie is canon. They reference everything that happened in it. 'The Flash' was the end of anything to do with the Snyderverse. Anything Gunn wrote/directed is canon.
If you wanted to start from the beginning it would go 'The Suicide Squad' ---> 'Peacemaker' S1 ---> 'Creature Commandos' ---> 'Superman' ---> 'Peacemaker' S2
EDIT: Forgot that he survived via the post credits scene. My point still stands.
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TSS LITERALLY LEADS


HOW CAN CREATURE COMMANDOS
ONLY CERTAIN ELEMENTS 

