Because you seem really overconfident in your ability to interpret other people's writing.

If I say: "You don't say what you mean with they" then there nothing overconfident about that statement. It simply shows that I know of multiple possible interpretations, while you might or might not be conscious of them. If you are you could specify your argument.

Scientific thinking is to seek for disconfirmation of claims. The fact that vague claims can be read in a way that's not disconfirmation doesn't mean that it's good to read them that way. Being to vague to be wrong is bad.