I am not an umpire (just a parent/coach trying to learn), so I cannot comment on mechanics. I am more interested in the play itself. I am not sure what the rule set was back then. The league is not affiliated with LLI, but some years have used LL rulebook while other years modified FED. IIRC, F2 dropped the ball in the collision. After the video ended, the umpire realized ball was dropped, but called the runner out for interference or MC maybe. They do have a must slide or avoid contact rule, so maybe that.was the reason for the out.
I am more interested in what you would call if it was straight OBR or straight FED.