Not looked at the youtube, but it could be OK. There are things called
spring loaded points, which are set to automatically send traffic on one
route (when approaching the divergence), but will allow traffic from the
other route to join the single route from either side (when converging).
Sometimes used with on trams to avoid the need for changing the points.

They're pretty common on tramways. Some mainline railways use them too,
but the speed limit is pretty low - 15mph on the Far North Line in
Scotland. Not really an issue when they're outside a station where every
train stops, but impractical on a line with express services. Most
mainline points are power operated and held in place by the motors (plus
a facing point lock if being used in the "facing" direction i.e. from the
single end to the double end). Running through these when not set for
your line will seriously damage the points and probably derail the train.

Mike