I tried it and it guessed FEMALE, correctly with me.
9 times out of 10, gender genie is correct.
But of course as with all the other "evidence" the IDIs have going, e.g. Lacy's exoneration, they will feed on this small percentage. The probability is that a female wrote it. Without using the gender genie, it is a feminine letter and Hold On will argue she can't tell that - but Hold on has not given a plausible argument yet, so I hold little credence in her posts.
Now the RDIs are an intelligent lot and it comes right through in their logical posts. I have yet to see a logical post come from an IDI. It is just the truth. IDIs come off as eccentric and out there a good portion of the time, sort of like the proverbial "art teacher" we all had in high school - most of them were nuts or well on their way to being nuts.