Thanks for your response. Since the last big bang of Orly, some terminals are definitely connected airside. For instance ORY2 and 3 are connected. But I have no experience for the others.
I asked the question to the Ultimate TA and received a negative answer "your flight will leave for ORY1A, so you cannot access the lounge in ORY2". I then asked if there was any lounge in ORY1 (our wiki thread says that it's definitely closed) and I received a very confusing answer (at least confusing for me) : "leaving from orly 1A, there is no possible lounge access. You can access the Orly 1C lounge only when leaving from Orly 1B" 🤪.
I am totally lost. Am I the only one to find the new Orly very confusing ?