Robin, nobody is arguing whether this is or is not garbage, and nobody is saying that the quality of Millenium Files is better than it is! The point I'm making is that if you're a garbage collector, it's important to know where the garbage came from. Is it household garbage? Does it contain toxic chemicals? Does it come in red hospital bags that require special handling?
If you don't know where the garbage came from, you have to treat it as the most toxic garbage available. The same with profiles. If the file says that John was born in 1623, no source, then I have no idea what I'm looking at. If it says the same thing with millenium file as the source, then I know it may be true, it may be not -- but that credulous people all over the internet are relying on it. It gives me information that is useful for research. And then, yes, I go and find better sourcing that can tell me whether the fact is actually true. And if it came from Millenium file and it's wrong, then I know that I need to acknowledge this pre-emptively, because otherwise someone is likely to come along and try to replace the solidly researched date with the millenium fantasy!
I suppose I worked in healthcare too long, and know that researchers can discover things important for public health by studying excrement!