Bob,
That is not how three phase works. There is no phase angle difference between two ends of the same wire, even if there is impedance in the wire. Do not confuse specific points on a wiring diagram as "phases".
There is a phase angle difference between the three pairs of conductors AB & BC & CA. There is also a phase angle difference between the pairs of AN & BN & CN.
The reference you gave (allaboutcircuits) has very simplified, if not misleading, information on the wiring diagrams.
In their words "Kirchhoff's Current Law tells us that the currents entering and exiting the node between the two loads must be zero" But, they never show actual current flow in any of their multi-wire circuits. They show 100% of the current always leaving the load and entering the source, the real world does not work like that.
