there is nothing to do with implied distribution from option prices calculated with Breeden-Litzenberer approach. this distribution is "risk-neutral" not "real". consider this as a sort of theoretical and artificial, regarding to real disribution, idea. in the article the author wrote about demand for puts. so they/she calculated these probabilities from outstanding notional of different options with respect to each other. put/call ratio, open interest for given strike / total open interest etc. these "probabilities" are just a proxy. for example, you see OI for puts for strike=7 jumped significantly, does it mean that someone bets on exchange rate decline? well, no. there are several possible reasons for this to happen. for example someone hedges his position in calls, or someone buys risk reversals (buy call, sell put). so you buy puts, market makers sells them to you and delta-hedges at same moment... no bets on downside.