Was this study funded by a pro-high speed train consortium by any chance? I've become so skeptical of studies lately. Isn't the easing of japan's housing price

Was this study funded by a pro-high speed train consortium by any chance? I've become so skeptical of studies lately. Isn't the easing of japan's housing prices due to japan population stagnation/decline and nearly 30 years of economic stagnation? Also, didn't japan's housing prices rise dramatically in the first 25 years of their high speed rail's existence before crashing in the early 1990s? Japan's population growth since 1990 has been pretty much 0%. California's population has increase nearly 50% since 1990.