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I don't think Girona is a tough opponent for a big team like Liverpool. First of all, Girona is not an experienced enough team for the Champions League platform. This team is far behind. Moreover, this team is not in good form this season. Girona is not able to perform well in La Liga. This team's performance in the Champions League is also very weak. Girona has lost four out of 5 matches and won one. Girona is in 30th position in the points table.
On the other hand, Liverpool is a very strong team this season. We have seen Liverpool win all 5 matches in the Champions League. And the top spot in the table is occupied by Liverpool. Liverpool is the only team in the Champions League who has not lost a point in any match yet.
Unless there is a major accident, the chances of Liverpool losing points against a team like Girona are very low. Although Liverpool failed to win against Newcastle in the last match of the Premier League. However, I don't think Liverpool players will make the same mistake against Girona.
I completely agree with your opinion about the comparison between the two teams, but personally I don't dare guarantee Liverpool's victory in that match. Anything can still happen because this is football, but what is clear is that Liverpool's chances of winning tend to be higher than Girona. Liverpool is experienced in the Champions League and they also have stronger squad depth, while Girona has nothing.
So far Liverpool have taken all the points from the 5 Champions League matches they have played, so they will of course try to keep this record safe and win the match. The probability of winning is certainly very high and many gamblers will probably consider the odds offered even though they are quite low.