No, the Pixel 9a isn't launching at Google I/O in May. It's said to have a much earlier release date this year

If you can believe it, we have been talking about the Pixel 9a since last September. That’s when we got our first rendered look at the upcoming mid-ranger from Google. That was followed by spec rumors and a report in October that claimed release was scheduled for this

Google is likely gearing up for the Pixel 9a launch at this year’s IO event. And, the new leak indicates what to expect in terms of storage and pricing.