Why not link to the wikipedia page: https://en.wikipedia.org/wiki/California_High-Speed_Rail which states:

" Since its inception in 2008, the Group has issued 18 letters and members have testified before Legislative and Congressional committees 15 times. In reviewing past letters and testimony, a consistent theme emerges: 1) project costs, schedules, and ridership estimates are uncertain and subject to significant risk of deteriorating, a typical experience for mega-projects; 2) the project is underfunded, and its financing is unstable, raising costs and making effective management difficult if not impossible; 3) more legislative oversight is needed. This letter reinforces the message, but with a sense of urgency over the ever-higher stakes.[6] "

Also: "Per the 2023 Project Status Report, the authority indicated the Interim IOS will go into service before December 31, 2030, with a "risk factor" of three years (which runs until the end of 2033)."

In the period between 2008-2023, several other countries (not just China) have started and completed many HSR projects.

Why should I link the wikipedia page? The current link perfectly rebuts OP's claim.