According to the post, autolocate only does something after a user initiated permission has been granted.

So on the first vist you still need to click the button. On the second visit the callback will be triggered directly.

But, well, nothing prevents a big fat html modal on the page pointing to the button, now does it? If you want to annoy your product^H^H^H^H^H^H^Husers then you can always find ways to do so.