Seems to be his main access point, I’d personally want something that doesn’t unlock when the power goes out.
I’ve recently purchased one of these (originally posted in the Aus Certified thread). It doesn’t have a key, but has the option for the lock to be externally powered via a 9v battery should the internal battery go flat. Unlock via PIN or with HA, works very well.
Tom has posted instructions on getting it working with Z2M and HA