Someone took your post to reddit and asking Poco to disable edl checks.Who said it's unbrickable? It's not. This thread is saying it's NOT unbrickable, because we're locked out of EDL mode.
ARB is a completely different thing. But Xiaomi phones with ARB also have locked EDL mode. So far only Mi A1 (and I think the A2's) are the only Xiaomi devices without EDL protection. It's there to block cross-flashing from reseller's, because it doesn't require unlocked bootloader to access EDL mode at all.
Read that recent XDA article about it, it covers all this stuff (I wouldn't be surprised if this thread was one of the inspirations for that article).
https://www.reddit.com/r/Android/comments/9k43uz/poco_f1_is_not_unbrickable_due_to_edl_mode_being/
Hope this makes them look into this and make poco true developer friendly.