lol yea the common fix for the automatic seat belts is to unplug the green plug down there & disable em.
lots of folks would do this if the door switch that actuates the re-tractor was going bad as it would cause the damn belt to move forward and back while driving & make the seatbelt light on the dash blink & beep incessantly.
Others would disable it because they hated getting strangled by those belts ( back in the 90s they were new & VERY VERY hated)
My best guess for the black tape would be that the vehicle may have had a blocked roof drain or leaky cowling at some point and was allowing water to come in down by that area. Hell it could ave caused a ground issue with that module and sent the belts haywire for all we know...
lot of things to speculate over given that location