Snake oil websites like that are a dime a dozen. There's alot of stuff about synthetic oil they don't want the public to know. Like synthetic provides virtually no engine wear advantage compared to conventional oil at normal engine operating temperatures and only a marginal advantage at engine start up, although that margin becomes more clear cut at winter temps near or below zero degrees F.
The truth comes out when you look at the claims made on the bottles of name brand (not off brands like Amsoil & Royal Purple) synthetics like Mobil 1, Valvoline, Pennzoil, etc. NONE of them claim an engine wear advantage compared to conventional oil at normal temperatures. They use clever language like "greater film strength" "greater protection" blah, blah, blah. Nothing specific like: extends engine life 40% compared to conventional oil."
The most important truth the lubewhore websites don't want the public to know is that a properly maintained and driven Lexus or Toyota engine will not be seriously worn even after 500,000 miles of using dinosaur oil. Lexus engineers know this and that's likely one reason why they do not embrace synthetic oil.