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Years ago, I had a Toyota transmission rebuilt. The rebuilders put hypoid in it when the manual called for 30W. The transmission ATE itself just after the warranty expired.
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Yep. The bearings will be burned up from lack of oil. Many modern manual transmissions use ATF which is about a 10 wt base oil. 90 wt will burn those up fairly quickly.
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When the gears turn, as there is no actual pump, the oil must be thick enough to adhere to the gears so that all round lubrication coverage is achieved. I don't think Tranny fluid is optimum for this application.
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ATF is missing the extreme pressure lubricant added to gear oil. A hypoid ring and pinion slides as it meshes so that ep lube is very important. ATF could allow a fair amount of wear in a ring and pinion if the vehicle is used hard.