Correct, auto reminder emails is only in the Joomla 2.5 version.
The frontend display of attendees is referring to the attendees list, which has been a part of DT Register for a very long time. It is enabled per event and you can customize what data shows in that list... some in the configuration area and some by enabling each field to be included.
This is NOT full records management. To get full records access... seeing all details as in the backend and being able to edit records is available only in the 2.5 version for the frontend.