His approval rating is, at best, in the low 40s. The Dems can lose this but Trump can't win it. From the article you linked: "These models — which are based on economic and other indicators — differ greatly from polls, which show Trump losing to perspective Democrat opponents, especially former Vice President Joe Biden." As long as Dems keep to a simple message that resonates with voters - Trump is a crook, the GOP are boot lickers, they're destroying health care - they'll do fine, again.