It is impossible to say for sure whether Satoshi Nakamoto will come back. Maybe Yes, maybe No. But the way he left (leaving the project in the hands of the developers and adhering to the principle of decentralization) suggests that Satoshi Nakamoto will not come back. This project should be developed by the efforts of the BTC-community without the founder's intervention, which would make the project vulnerable (centralization).

If we assume hypothetically, then Satoshi Nakamoto's return will not necessarily have a negative impact on the price. Maybe even the opposite, Satoshi Nakamoto's return will create additional hype for the project and cause an increase in demand for this asset. It seems to me that faith in the value of bitcoin can only be undermined by Satoshi Nakamoto's start selling bitcoin from his wallet. These are all just assumptions.

I don't think that curiosity is a catalyst for investor interest. I believe that the most important role is played by "faith" in the future of the asset (both from the financial-economic and technological sides).