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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.
The four teams in the Champions League semifinals have one team left from each league. This is what makes it interesting, which team from which league will be able to win the Champions League trophy this season.
Arsenal only has hope in the Champions League because in the EPL league Arsenal has given up because the trophy already belongs to Liverpool. While the other three teams are still competing in their respective leagues and only PSG is safe in the domestic league. Arsenal's journey in the Champions League is quite impressive, especially after they managed to beat the defending champion Real Madrid, their confidence has increased.
So Arsenal's chances are quite big this season to be able to win the Champions League trophy, especially since Arsenal is very good at playing against teams with open games like PSV, Real Madrid and now PSG who often play open games. Of course this is very beneficial for Arsenal. Because so far I have seen Arteta still confused about solving the opponent's tactics that use a low block strategy or with a team that is solid in terms of defense. So my prediction for this match is if PSG plays an open game, I am sure Arsenal will win and qualify for the final.