Guys... I don't get why y'all have to be so mean. Seriously, give this kid a break.
Think about it this way: if you are a 20-second 3x3 solver, and you want to get a 3x3 record (continental, world, etc.), you obviously won't get any legitimate records for SPEED any time soon. But if you try for a record based on ENDURANCE, or solving as many as possible, then you, as a 20-second solver, will suddenly have a chance because speed doesn't matter as much anymore. This UWR attempt is just like a UWR attempt for solving cubes underwater as possible, or solving cubes while running a marathon, or anything like that: if you can hold your breath underwater AND solve cubes, or run a marathon AND solve cubes, or hula-hoop for 45 minutes straight AND solve cubes (or Pyraminxes in this case), then you deserve a WR.
Perhaps we all expect cubing WR's to be speed-based, instead of endurance-based, because (except for MBLD or FMC) that's exactly what all competition WR's are: fast. But it's time we shift our mindsets a bit. Riley might want to look and be fast, but this WR has nothing to do with that. It takes a completely different degree of willpower and concentration to do things over a long period of time as opposed to a short period of time. Sort of like running a marathon versus running a 100-meter dash.
I believe that if Riley was trying to solve a Pyraminx as fast as possible while hula-hooping, then the UWR would be pointless because almost anyone can hula-hoop for the amount of time it takes to solve a Pyraminx. But solving 138 Pyraminxes AND hula-hooping is different. I don't think very many of us could pick up a hula hoop right now and spin it for 45 minutes straight, not to mention doing that WHILE solving Pyraminxes.
Basically, Riley's WR is not useless. Riley's WR is not undeserved. But Riley's WR is well-earned. And if you haven't tried it, you should probably stop talking. I tried the same attempt, and I barely did 20 Pyraminxes before dropping my hula hoop.