Click on any of the headings in [brackets] on the top of the page to see the language pairs available for download for that collection.
However, the content is actively getting curated. E.g. https://tatoeba.org/eng/sentences/show/137571 is a translation of "I love you." owned by a native speaker. The search form doesn't make it easy to find native-speaker translations, though. The search option to limit results to native-speaker sentences only works if you're searching in the target language. E.g. if you want usage examples for "愛": https://tatoeba.org/eng/sentences/search?query=%E6%84%9B&fro...
If you're only using Tatoeba as a data source for automatic creation of course material, though, you can filter using whatever criteria you want.