When this happened in 2018 the reports all noted that cougar attacks are super rare. Maybe they're going to be more common as the 'burbs continue spreading into cougar territory.
From the 2018 article:
Fatal attacks by cougars on humans are highly unusual. This is only the second death in Washington in the past 94 years. However, the state Department of Fish & Wildlife says significantly more cougar attacks have been reported in western North America over the past two decades than in the 80 years before.