But it's also a small sample size and there could be many reasons why, in that group, the numbers came out the way they did, including natural clustering.
That would also explain the OPs anecdote as it's very possible an individual hospital is seeing more hospitalizations among the vaccinated just due to the vagaries of statistics. That's why large sample sizes and careful analysis are so important when coming to these conclusions.
But we have substantially more data from Canada and the UK and so far that data shows that the vaccines are effective versus Delta.
What concerns me about that case and some of these other anecdotal stories with similar breakthrough percentages is that it can also speak to possible vaccine batch quality issues in a given region/area. The storage and transport of the mRNA vaccines is a bit complex already to ensure effectiveness.
What? I cited a recent study from Britain. Did you read the comment thread and the supplied references or are you just knee-jerking?
I then provided reasons why the two known datasets that might sugggest particularly poor vaccine efficacy versus Delta (both of which I was aware of) should be taken with a grain of salt. In the case of Mass, the dataset is small and hard to extrapolate from, and the Israelis released neither their data not their methodology so we can't evaluate the quality of the study.
Unless you can explain otherwise those are both perfectly valid reasons not to cherrypick those studies to make the case here, particularly given they contradict a mountain of evidence that leads to different conclusions.
Of course, you're more than free to similarly critique the citations I provided if you care to.
Frankly, I'm not sure you know what the No True Scotsman fallacy is...
In the Provincetown, Massachusetts outbreak: "Among five COVID-19 patients who were hospitalized, four were fully vaccinated".