The example does work on certain devices which have trouble displaying WebAR on PlayCanvas now, as is the case with the Samsung Galaxy S9+. Something to note is that WebAR in PlayCanvas used to work on those same devices in the past.
EDIT: On another phone, the example does not work now, although PlayCanvas WebAR did work on it in the past. (UleFone Armor 6, Android 8.1.0, Chrome 113)