I can understand your skepticism, but you may be slightly misinformed. High speed rail corridors don’t pop up overnight, and they take longer if you want it to be built as economically, safe, and well-thought out as possible. For this project we are about 15 years after voters approved the idea 2008, so that part is true as you say. So planning is done to get the most efficient and effective path which takes years, consulting the public takes years, building it takes more years, then testing and commissioning is the cherry on top. The American idea of “I can do this all by myself without any European/Asian help” is certainly slowing things down and making it expensive as well. Due to inflation the costs also will rise but so will the cost of any alternative be it maintaining highway systems, managing traffic and pollution.