There is no "self destruction", I don't really know why you think there is. The license requires you to provide source code for the MPL-2.0 licensed source code

There is no "self destruction", I don't really know why you think there is. The license requires you to provide source code for the MPL-2.0 licensed source code files regardless of how your software is built (that's why it is in fact copyleft). What it doesn't do is force you to license non-MPL-2.0 source code files under the MPL-2.0, even if you combine the two into a binary. It is explicitly non-viral, but still enforces copyleft protections onto the originally licensed code.