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I don't think so, where teams like Real Madrid and Bayern Munich have not had any impact on PSG's performance, Arsenal may not have much of an advantage. PSG will not be able to win against Arsenal by such a large margin because Arsenal's defense position is quite strong but Arsenal will also not be able to win because they do not have any good finishers. At the moment we have to accept that PSG is the best team and they are in the best performance right now, so no matter how difficult their opponent is, they can easily perform well against that opponent and defeat that team. However, it remains to be seen how long they can actually maintain this consistent performance.
Any team can stop PSG as long as they play well and maximize their goals opportunities. Remember, Botafogo beat PSG 1-0 in the group stage and managed to prevent PSG from scoring until the final whistle. Chelsea or any team can beat PSG, but given PSG's recent form, I don't think Chelsea can do much. PSG are favorites in the final and Chelsea are challengers, but Chelsea can win if they know how to stop PSG.
There's no guarantee that PSG will win the Club World Cup, but their chances are certainly high. The team is in good form and everyone is excited, but we can never underestimate Chelsea when both teams have the time and opportunity to win it.