Unable to reproduce this issue, we tested this issue on Mac 10.11.6 machine with chrome version stable 53.0.2785.143.
(1) Installed chromevox extension.
(2) opened the test url and runned the script.

Observed that chromevox is reading the "Hello World!" and other two input fields with inside text
Could you please try this scenario with clean profile without using any apps or extensions in your browser and let us know your observation.

For me, neither of these input fields are being read out as 'required' by ChromeVox on Chrome 54.0.2840.71. I'm not sure if this is working-as-intended, since when you inspect them in dev tools, neither of them actually have aria-required="true" in their HTML. This is what I get for both Textfields, respectively:

<input type="text" required="" placeholder="Should have aria-required">

<input type="text" ng-required="true" placeholder="Should have aria-required" required="required">

Adding aria-required="true" for either of those input fields does make ChromeVox tell you they're required. Again, not sure if this is WAI, sending to other components where hopefully someone else knows more.