This app was mentioned in 4 comments, with an average of 1.25 upvotes
No, this is very prominent on the lock screen of the phone, with a banner across the lock screen that says "In case of emergency". Tapping it opens the emergency information without unlocking the rest of the phone. No face ID, no passcode, nothing except tapping the banner on the lock screen. No one can use the phone, but an emergency responder can then contact my emergency contact. Here's the app I have: https://play.google.com/store/apps/details?id=com.clusor.ice&hl=en_US
​
​
That's almost never true. Android is more open. It's why we have Android phones in the first place.
For example, here is a free app that does the similar and more. https://play.google.com/store/apps/details?id=com.clusor.ice
Of course, you could probably use Tasker to set up the "repeat click home button X times" cue and customize it t.
I use an Android app called ICE that displays all relevant emergency details on my smartphone screen even when in lock mode. https://play.google.com/store/apps/details?id=com.clusor.ice&hl=en