Today Google announced that the Pixel 4a and Google Pixel 4 (and XL) were the first Android smartphones “to go through ioXt certification against the Android Profile.” That makes the Google Pixel 4a the first smartphone to be certified as such as a “newly launched” smartphone. The Internet of Secure Things Alliance (ioXt) assesses a baseline set of requirements for security, upgradability, and transparency.

The iOxt profile with Android is defined as running Android and qualifying under the GMS certification process (or equivalent), passing a number of tests. The tests begin with Automatically Applied Updates.
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https://www.slashgear.com/google-pixel-4a-the-first-ioxt-secure-phone-at-launch-watch-the-list-11633037/