Then they need to state it, because the only data they’ve given is that they asked a group of 13 people, one group, which is still not an adequate sample. Period.
That, right there, is why focus groups shouldn’t be used for this to generalize a larger population, because the data is being misinterpreted to sell a biased story! Probability would be estimated if they actually conducted a full study. Which they clearly didn’t.
And you can’t use previously gathered data from battleground states to estimate results after an event. They’re snapshots of an opinion at that given time. You can’t use them for an event that occurred after the fact. Again, that’s unethical and inappropriate.