The simulator answers one question: given how this actually trades, what are the odds of passing that evaluation before breaking one of its rules. It uses the same firm rules as the directory, so there is no second rulebook to fall out of step.
It needs one of
Your own days
The daily results your accounts already produced on Tradeus — the same per-day figure the calendar and the journal report.
A trade list
Imported results, from which it takes the distribution.
It prints nothing without input
The page used to ship example strategies and invented firms and report a confident probability from them. Nobody had traded them. A pass probability is the figure someone sizes a $300 evaluation against, so with nothing supplied it now says nothing at all.