Yes, it's a one-game win, and Chelsea played exceptionally well in that match. Perhaps they'll face Paris Saint-Germain again in the Champions League and not play the same way. Perhaps they'll play the same way and beat Paris Saint-Germain again—time will tell. Chelsea drew their first Premier League match, but because every match is important in the Champions League, they should strive for more wins.
A team can do very well in one match and it can also be very bad. To determine the best from the team, consistent performance is needed. Those who have consistent performance can do well in all aspects. Chelsea draw in the first match of the Premier League this season, although it is not a big deal, but the start as a team has not been good. Although this season has just started, the team should do well from the beginning.