Should be. They cannot penalise people when their facial recognition failed. What choice do we have other then go manual counter when that happens.
I asked the officer during registration last time that what if I travelled in by car and going out through egate, she mentioned it is possible and can exit the egate.
As for going in by egate and coming back by car, need to inform the officer at counter that we entered by egate and he will chop the passport and write something on it as mentioned.
My wife and daughter tried before. Both entered through egate but as my daughter got issue with her face recognition while using egate coming back, my wife accompanied her using manual counter and explained to the officer and got their passport manually chopped with comments.
*As of now, my daughter still having issue with face recognition using egate and can only use manual counter even though already registered for Macs. Will make a new passport next month along with myself and re-register again and hopefully hers will go through after the passport change. No issue for myself though. Both our passport expiring next Jan so just nice can update her photo in passport.
Below are how it looks like.