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I love that part where you said they no longer rely on one player which actually makes them more deadly. Yeah, when a team is like this where they don't rely on single player to make or get the goals for them, they become so unpredictable because when you think you're marking a particular player out another steps up in his place. Against Aston Villa, in both legs Dembele didn't get a single goal, it was only two forwards that scored in the entire two legs which is Kvaratskhelia and Doué. PSG scored a total of 5 goals across two legs and 3 of those goals were scored by two different defenders. That's what makes them dangerous.
Arsenal are the only Premier League representatives still in the UCL, they will also face opponents who have eliminated other EPL representatives (Liverpool and Aston Villa). Now the big hope is on Arsenal to win the trophy, but as you said, Arsenal will have a big challenge because PSG plays more collectively since Luis Enrique took over.
Now Arsenal just need one more win in the EPL to secure a place in the top 5, they have to give their all in the UCL because the EPL trophy is already Liverpool.