No, I have already converted the MCUXpresso IDE project the VS Code. I was running into this "repository does not contain board" error when I tried to open the converted project on another device using the "Import Project" button in MCUXpresso for VS Code. I only got this error after removing the examples from my SDK.
However, I have since realized that after converting the project to VS Code, I don't need to use the "Import Project" button. Instead, I can just open the project in VS Code and it will be detected as an MCUXpresso for VS Code project. The SDK and toolchain can then be selected using with "Configure" > "Associate Repository" and "Configure" > "Associate Toolchain".
When opening an MCUXpresso for VS Code project this way, I avoid the "repository does not contain board" error.