I don't see Musk doing that as he directly stated it himself.

As for Tesla patents, I would speculate that it's more about companies not willing copy Tesla which is why Telsa doesn't really care if they open source the information. Copying isn't always so easy especially if there are structural issues involved. Recall the superchargers that became standard. Other companies were using a different connector, but the supercharger connector was obviously superior and they relented after many years.

Patents are more useful in situation in which your designs are easily reverse engineered and there's little barrier in copying. In any case, there are firms in the automative industry that specialized in doing the teardown of cars and doing cost estimation. Such a firm would tell their competitors how Tesla actually make their cars, so there's not much value in publishing their patents anyway, other than PR stunts.

Patents are not as useful in scenarios in which trade secrets provide a strong and durable barrier to entry. They also require lawsuits to enforce, which is rather costly and imposes cost on our economy, so there's inefficiency to consider as well. Theoretically, a monopoly in this instance would incentivize R&D effort but we know that monopolies has various nasty side effects and not everybody have money to hire lawyers and enforce them.