Except there is no market data here only suppositions as contracts are subject to confidentiality. This is pure guesswork by people trying to look more professional than they are.
That website tracks the asking price from REINS. Earlier the site provide the complete raw listing data from REINS but your friends from the industry stopped the company from providing this.
It might err on the high side in a weak market.
I used it when I moved to Tokyo. You could see how long a house had been on the market, how much it had rented for many years earlier, etc., etc.
I know of a specific SFH (around 250 SQM) in Akasaka, which is rare, that rented for 1 million in 2008 and then the owner was going to put it on the market for 800k (we thought it was too high) in late 2010 and eventually the asking dropped to 580k in 2011.
I don't think you will experience this type of price cutting in the US.