Author of that PR doesn't seem to be a Microsoft employee. Keep in mind that anyone on GitHub can create PRs against VSCode.
Author is absolutely from Microsoft
https://github.com/microsoft/vscode/pull/310226
https://github.com/cwebster-99
Even if that would be so, the person who approved it certainly is.
Author is absolutely from Microsoft
https://github.com/microsoft/vscode/pull/310226
https://github.com/cwebster-99