TaskCompletionSource TrySetResult incorrectly states it will return false is the Task is disposed

The below line also contradicts that it will actually throw a DisposedException if the Task is disposed.

This method also returns false if the underlying has already been disposed.

Checking this, seems to verify that it will throw instead of returning false:
https://referencesource.microsoft.com/#mscorlib/system/threading/Tasks/TaskCompletionSource.cs