I agree. The formal definition of a RE “buyer’s market” is where supply outstrips demand (at current prices, at least), thus leading to lower prices in the future. In the stock market, the equivalent term is a “bear market”.
But calling a RE falling market a “buyer’s market” is a very unfortunate choice of words, because it implies in the mind of the audience that “it is a market good for buyers”. Nothing can be further from the truth.
Ironically, the stock market names have the opposite meaning. If a “bull” is a buyer, and a “bear” is a seller, then a rising market is called a “buyer’s market”, and a falling market is called a “seller’s market” in stocks.