I wouldn't say "every instance" is is preemptively doubted, but there is a wikipedia page on false accusations for a reason. With most studies indicating double digit % of false accusations. (and some numbers far higher than I would have guessed [0])
I'd say a better phrasing is that innocent until proven guilty applies - just like with other crimes. Crowd sourced lists aren't that so treating them with some caution is warranted.
I can see how even an unreliable list may be of use practically to women though even if process wise it is quite dubious.
[0] https://en.wikipedia.org/wiki/False_accusation_of_rape#Estim...
Your source doesn't really say what you're stating though. The ranges seem to be 4-13%, with the majority closer to 8. The one that was highest for the US (10%) was a self-reporting survey that asked people if they had been falsely accused -- surely not the most reliable method.