Lazio will only aim to draw the match in the second leg. The team will not be able to win the away match against Bayern Munich. Because Lazio knows very well that it is very difficult to win against Bayern Munich. And they were very lucky to win the home match. Lazio will be tactical in the second leg. And will play a completely defensive strategy. It will be very difficult for Bayern Munich's players to break down Lazio's defence.
In my opinion, choosing a defensive strategy against an attacking team is a very bad strategy, but on the other hand, Lazio has no other choice, and they can just hope that they can not concede a single goal from Bayern in two matches, it sounds doubtful, but they need to proceed somehow from the existing situation.
And whatever the situation in the team, even if this is true and the players thus showed Tuchel that he does not decide everything, it seems to me that in the match with Leipzig the situation changed and in the return match with Lazio, Bayern will show a completely different game. Just look at Bayern's stats, how the team generally plays, how many shots on target they average per game, and how many they did against Lazio. If Lazio can at least draw in Munich it will be a very big sensation.
This is not a bad strategy because after all, Bayern Munich's fierce resistance is difficult to avoid, especially since Bayern Munich has a capable attack line, in contrast to Lazio, which does not have attackers who are active up front and capable of creating lots of goals. Indeed, the defensive strategy is not a challenging strategy. but at least that's all Lazio can do in this away match because we know what Bayern Munich's strength at home is like. And Lazio was lucky to win in the first leg because otherwise Lazio would have absolutely no chance of advancing to the next round. Lazio's hope in the second leg is to be able to surprise everyone by getting rid of Bayern Munich (but that is a little impossible).
Bayern Munich still won't just give up in the Champions League. Tuchel also won't let his club be eliminated like that, especially against Lazio. This is of course a bit embarrassing for Bayern Munich even though a club like Lazio cannot be underestimated even though they don't appear in the domestic league good and consistent but when in the Champions League Lazio play more focused so as not to be underestimated that's why they play a defensive strategy just look at the statistics of the previous match when Bayern Munich fired shots none of them were on target so Lazio is a little confident at the moment and yes, maybe as you said it would be better if Lazio achieveda result a draw 1:1 and they can qualify for the next round.