Not to be rude, or anything, but you don't have to do good research to discover that every single thing you have stated is...objectively incorrect? I can't think of a better statement to describe them. To start with, you just assert various things without justifying them in the least.
1) Walters didn't say that it's hard sci-fi. The Codexians just can't read.
He said that it's a sci-fi that somehow, subjectively, its boundaries can be seen by some as 'hard'.
2) Had Walters even actually said something like that, the problem is that he has been a lead writer for only the half of ME2 and ME3. Casey Hudson, however, the lead producer, who came up with the idea of the universe and worked with others to establish it properly, has specifically said that it's a homage to sci-fi shows from the 70s. Hell, Walters himself makes very specific allusions to Star Trek and Star Wars.
3) I expect them to learn to read English, for starters.