yeah lol i was surprised too... glad i looked it up rather than just agreeing! the book mentioned in a few places that li-ion batteries chemistry is constantly tweaked by the manufacturers so it's impossible to give 100% correct information for all of them, for example they might increase capacity at expense of something else. obviously they don't have time to test it for a year to see the discharge rates in this case. So, I guess it's always a risk to store these things.
I wanna see a slowmo video of a N900 battery being overloaded to the point of explosion while still inside of a N900, i keep that thing next to my crotch after all....
yes, according to that book i was quoting it says they are dangerous to charge at that point so the protection circuit purposely bricks it
in addition there probably is no point even trying. every source I've come up to has said that if low voltage limit is reached, all you can do is dispose the battery correctly. that's why safety circuits are above that limit:you cannot go below critical level unless you leave your battery to drawer for longer time etc.