This gets perpetuated all the time on this forum and I have never see any evidence to support it, and even if it were true I doubt toyota would admit it. What do we hear on here: “electronics built to aerospace standards”, “built to 500k miles all off road”, …
Seriously you think Toyota makes their other models “less reliable”?
Camry, rav4, Highlander, tundra,… GX, LX, LC,…. Are all built to the same reliability standards. There are “million mile” examples of all of them out there. If anything top tier models from all brands are less reliable due to being more complex. Computer Head units, complex cruise control, power everything, parking sensors, rain sensors, …. Are more complex and less reliable the. Not having those things.
People (self) justify more expensive (luxury) purchases all the time based on many biases that are not based in evidence.