Ground rule doubles that prevent a runner on first from scoring probably happens every week in MLB. It isn’t a big deal until it happens in the playoffs.
I agree with K9 about taking the guesswork out of the call. On this play the runner would have absolutely scored. But I’ll bet there are a lot more tweeter calls that would have the manager of the team not getting the call flipping out. Where is the theoretical line where the runner would have definitely scored?