if you look at the elliot notation and fibo extension placement, then wave 3 is right at 1.618, which means wave 3 is already 1.6x longer than wave 1.
I want to predict where the USDJPY price moves using the fibo extension, and it could be that the price goes to the fibo extension of 1.618 as well. if you look at the trendline, there is a possibility that the price will respond positively to the trendline, which also meets the fibo extension area.
I think this notation is quite correct, because wave 3 is not the shortest wave. as evidenced by the price at 1,618, and wave 5 could be a bullish continuation, this type of bullish can run for quite a long time. if you want to go short, it's better to wait for a fairly positive bearish confirmation.