Should still be the best you can manage, but it often takes another pair of eyes to see things you've missed. Doesn't always work, though. I once had a publisher's proof reader put a mistake INTO my book. I'd correctly written computer 'program' and she changed it to 'programme' throughout. So everyone who read it would have thought it my own stupid error - duh!
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When I edit or proofread, I make certain the author knows that the changes are all advisements - It's up to the author to go over the work I've done and either accept or reject every alteration I suggest.
If that had been the case with your proofreader, you would have picked up the error and it wouldn't have gone through.