When I went on 8/17/21 I was prepared to show my vaccine card but it wasn't necessary. I interpreted that to mean that the exhibit doesn't fall under the parameters of the city's new vaccine policy. Since enforcement of the new policy doesn't start until mid-September the exhibit will have closed before then anyway.
We wore a mask but they didn't ask to see vac card.
My wife and I went on the 18th and were not asked to show proof of vaccination. Of course masks are required, and there is a thorough bag search.
Since the proof-of-vax requirements are new, I don't know. It's supposed to be timed entry but they didn't seem too particular about that either.
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