The source may be correct, but it’s not useful. To judge the risk you’d need a breakdown of where accidents happen - it may be the case that motorways have become much safer due to safer cars, but pedestrians and cyclists suffered.

Especially modern pickups and SUVs have an increased risk of severe injuries for pedestrians due to the high front area which hits vulnerable body parts where a station wagon would hit legs. You’ll likely find two or more overlapping trends.