There's making parts "more freely available" and then there's "you can't have this from us, for any price". Fortunately the ludicrous amount of power in the Model S and people's inability to control the car (or themselves) means there's a good sized underground market of salvaged Model S' bodies and parts, even if there's no office service manual available to amateurs.

Meanwhile, Chevrolet will just sell you the engine from a corvette in a crate. (Okay, it's ~$12k, but they're willing to do it.)

I say this as someone with a Model 3 reservation, mind you. Tesla wants to build the iPhones of the electric car industry - no user-serviceable components inside, and the battery isn't removable by us mere mortals who don't work at Tesla. (Abandoned battery replacement tech demos from a few years ago aside.)

But certainly on the Model S, the battery is not that difficult to remove/replace - again, there's plenty of YouTubers who have done this.

You can even, in many cases, swap a higher capacity pack into older/lower-spec models if you're so inclined. There is no DRM or software checks that prevent this from working!

They do actually make the manuals available to anyone, just for a hefty fee if you're not Tesla-certified:

https://service.teslamotors.com

I'm not in the EV or Tesla communities, but I remember reading something about "activation" being required?

If you can prove that the vehicle has been appropriately repaired (by a qualified body shop, since it's a safety issue in the case of structural damage), it can be re-activated.

But Tesla does not remotely disable vehicles or anything like that. Even if it's been written off, theres nothing to prevent it being driven just like any normal car once repaired.