In the old implementation, ELTA and ELTA Courier used the same way to fetch status messages. Unfortunately, this didn't work for (some?) ELTA only tracking IDs which is why I decided to temporarily remove native support for ELTA.
You can still use ELTA Courier to receive the same results as before.
That said, the ELTA website took me a while longer to implement natively as it required a little different handling that hasn't been used in the app yet. The next update will restore native support for ELTA, giving you the exact results as seen on their website.