This is false. Pure FUD. The LA taxi union isn't a very powerful union, and was never the primary roadblock to building the Green Line all the way to the airport. The FAA was the reason: they thought the power lines for the rail line would interfere with landing paths of planes. https://www.dailynews.com/2008/01/09/why-green-line-stopped-...
California is corrupt as fuck, from GM paying LA to take out way more efficient train lines so they could sell buses to Beverly Hills preventing LA from building a subway. It makes living here absolutely miserable.
This is also a fraudulent representation of history. The old rail lines (i.e., Pacific Electric) were never profitable because they were intended as loss leaders for suburban housing developments. The lines ultimately went bankrupt when cars became popular because they had a max speed of approximately 15 mph. When LA formed its nascent public transportation system in the 50s, it acquired the few busy/profitable lines remaining. Some of those rights of way were used for new rail construction (for example, the E line to Santa Monica).