this is a bootleg and it does say
'Alleged
Live At Black Metal Marathon, Oslo, 1992
Burzum never played
Live '
Meaning that this is questioned, nonetheless the record does exist and admins at SoM verify this before validating.
The fact that metal archives does not list bootlegs is their problem. Bootlegs are an important part of a metal band discography and for any given fan such information is good.
Anyway... who would want to see
Burzum play
Live from a prison cell .... just kidding