A new one for me

That sounds about right to me. 

In OBR, the ball remains live on this play (3B is only awarded once the play is over, I think, and the batter is allowed to attempt to score), and I believe it would be scored an error on the LF for the base award, and I assume you could also score an error on the SS prior to that as well, as described.  Not sure if FED would be different.

The runner had stopped at second and the play was dead when the call was made, so he got that part right.

Flat out announed to the entire croud he'd been umpiring 30 years and never made that call, so he could cross it off his bucket list.

I score it BHP....Benny Hill Play, Q the music and slap a bald guy in the head. 

One funny thing about this story is the umpire annoucing a "triple" because almost every umpire I have encountered have little use for stats and scorekeeping beyond the correct batting order and how many outs there are.  I am thinking you are right and he was pumped to get to show off a little about a little used rule and just used a little shorthand to describe the award. 

It is a lot easier to say and for the knot heads in the bleaches & dugouts to understand "triple" instead of "three base award for a fileder throwing the glove and touching the live ball"

LUV: I have a saying in these situations, "Queue the Calliope" which is my way of saying the CIRCUS IS ON. In this case it was a little "umpires gone wild" and "outfielder with a bad back". Not a situation you see in scoring very often.

Agree with you there.  Have been player, coach, ump and scorekeeper at various times and have never seen anyone come close to throwing the glove in upwards of 2,000 games over 25 years.  This rule won me a few beers after softball games....phrased as "Is there such a thing as a ground rule triple"