They did rapidly expand the monetary supply and it did cause inflation. Assets are sky high (stocks and real estate). Properties are priced 10-20x cash flow. Stocks are similarly trading at absurd earnings ratios.
Does anyone remember https://en.wikipedia.org/wiki/Japanese_asset_price_bubble ?
Massively expanding credit to the point where money is free .... reduces the value of money. But denial is a helluva drug.