You are correct.
This is just part of the nature of a new app that uses historical data.
We have considered multiple options for this, but at the end of the day we still can't help everyone. An option is using the schedule importer to import actual times from your company website if still available that far back. This isn't ideal because it will only include flight time and you will still be missing duty and rest data, but it may be a start for you.
If a user doesn't have Logbook Pro or APDL on Palm and have just purchased APDL for the first time, they can't possibly import that data at all, so even importing past data from those programs still isn't a perfect solution.