Is that what it signals? As someone who isn't a native speaker but believes themselves close to one, I don't read it that way. I understand that "X says that Y

Is that what it signals? As someone who isn't a native speaker but believes themselves close to one, I don't read it that way. I understand that "X says that Y are Z" is less strong a statement than "Y are Z", but with something as complex as this, it's hard to state it as fact without coming across as if it is your own research or conclusion. I can write 2+2=4 without that, but I can hardly write that donald duck running a leading economy is bad for the whole planet without it seeming like an opinion to those who either looked at different examples as I did or those who are not completely convinced it is a fact. (That was exaggerated obviously, but you get the picture: if I had written the donald duck statement like "scientists say that $complexSystemThatFew(IfAnyone)CanTrulyProve", it seems more likely to be true than without it, regardless of whether it truly is a fact.)