BPMAsus doesn't do public betas it's more like an "closed" betahttps://zentalk.asus.com/en/discussion/comment/148624#Comment_148624
Keep in mind that this is just a beta test, and the linked Twitter post is from someone who (apparently) works at Asus France. It's likely going to go through an internal-only beta test before being released to the public.
I'm not sure if Asus does public beta tests for Android or not. Either way, we should probably hear some official news about this in the coming weeks.
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You fill up the beta tester form,then they select based on your answers and forum activity I guess (the rules for the beta state being an active and participating member on zentalk)
So it basically goes like this
~ A beta registration page will be available to those interested,the forms generally stay open for a month or so
~ all the selected users get a mail informing that they've been selected and soon beta 1 is pushed to those users
After that it depends upon the amount of bugs reported and the time devs take to fix them (it's best to report as many bugs as you can this period as devs are move pro active to fix anything broken/change something in this period compared to the otas after the stable update), an average time between consecutive betas is one week with new ota being pushed every Friday or so
*All the selected beta users will get access to an beta specific forum to report bugs by the way (you can create new threads and reply in existing ones)
Fyi I was an Zenfone 5z beta tester for android 10
The mail:
Beta specific thread:
Phone community>beta community forum
You'll get the direct link to the thread through mails too though
