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Yes, HEPA filters are more than sufficient if they genuinely meet these specifications.

The nominal rating is stricter, but is the certification process that the claims of the nominal rating are actually met as strict?

There's what it says it does, and the probability that it actually does what it says it does. Those are two different considerations.

That's a different argument -- whether or not the HEPA filter really is a HEPA filter.

And whether the seal around the HEPA filter that the HEPA filter is put inside is airtight.

E.g. I've seen some vacuum cleaners which have HEPA filters reviewed as a bit useless at filtering because the particles flow through small gaps around the filter.

My mistake.