Again, you’re conflating two different things here. Evidence and hearsay are simply not the same thing. There is a big logical difference between something that’s a verifiable a fact and and assertion. The accusation of a million people being held in encampments is the latter. There is no evidence anecdotal or otherwise to support the assertion. Furthermore, legally speaking, both anecdotal evidence and hearsay have zero value if you really want to go down that route.