Let's suppose there is no published source to corroborate the statement I wrote. Is the statement ipso facto untrue?
Alternatively, let's say there's a source, but I don't provide it. Does that effect whether my statement is true or not true?
Thirdly, now let's suppose there's a source available, they've measured it, found a result that agrees with what I wrote, and I offer it up. Now what happens? Does that change anything for you? Do you say, "Oh, when I wrote [citation needed] before, what I really meant is that I disagreed with you and was trying to express that through a sideways remark. I've considered the information in the source you provided, though, and have now adjusted my mental model accordingly."
I just want your answers before I invest any significant effort into trawling through data and putting work into a response. Otherwise, it would just be a massive waste of time on my part, right?