Of course it is in-house like any other Lange watch. Of course some specific parts could have been developped with some external providers but why do you have such question in mind?
The PC module was designed in-house and is exclusive to Lange. But I never feel comfortable with this kind of question since I don't know what in-house exactly means. Do we know if a specific department of another brand from Richemont was involved or not for a specific feature? Nobody knows at the end and for me the most important is the outcome.