Yes, if LH pays for *G access to the lounge. As you can see in the TP and SK threads, it is not a given.

I believe (and I can't be really bothered to check) that the *A policy language used to say something along the lines "if the airline contracts a lounge, then *G access is automatic", but it has been amended to specify that a contract is required.

According to the LH website, a *G Flying LH from NCE would have access.