Regardless of the way he went about it, he does kind of have a point though....what are we supposed to base our guess on about the longevity of an unknown tranny out of a 16 year old car from another country and an unknown previous owner? Could've been a 35 y/o guy with 20 years driving experience...could've been a 16 year old kid learning to drive his first stick and drifting down mountains on the weekend.
Did you have it opened up? inspected? Any other info to go on? Short of that...grab a tarot deck or flip a coin, it's anyone's guess. The fact that it feels good now and works well is a good enough start to be happy about I'd think

(you could've gone through the install and found out you bought a tranny with stripped gears or a million other issues)
No disrespect intended at all, but before you dole out judgement against the entire forum based on one smart-ass remark (from a mod or otherwise), I can't help but point out: you're not new here.
In 15 months of being a member you didn't notice any trend of certain people here making valid points with sarcasm and humor mixed in? Personally I think it's what makes this site work over some others I've been on where everyone's so tight-assed and serious to the point that there's nothing there to enjoy. If/when I break a tranny I fully expect to get my driving skills critiqued, regardless of the cause

(fwiw, I'll probably blame it on a 70-20 downshift to second without a computer rev-matching for me

)
Anyway, glad you're happy with the new-to-you tranny and hope it lasts you the life of the car

P.S.
I do agree that Phong's explanation quite possibly hit the nail on the head to explain the order of events