[catblast]

That paper is not good support for your pedantic argument. (More pedantically, any coin without uniform density is "weighted" by definition, regardless of toss bias)

In fact, most methods of coin toss will be influenced by an unbalanced coin in some way. The paper only demonstrates that if you flip a coin with a certain precisely specified method (and catch it midair) - can you be reasonably assured a weighted coin will be unbiased.

See their own referenced book Jaynes, 1996 pp 1003-1007, which I think gives a much clearer explanation of the possibilities.

Note that the NFL for instance does not catch the coin, so there's at least a real world where a coin could be biased.

The important part of that paper is this:

"Examples of how others have flipped and tossed coins show the students how essential it is to carefully describe the experimental process." not just the one detail about angular momentum and CoG.