TensorFlow Lite is now LiteRT
developers.googleblog.com
developers.googleblog.com
Odd choice since it strongly undermines the stated purpose of the rebrand in the first place: to break it away from the Tensorflow brand and emphasise it being model/framework agnostic. Working with ".tflite" files more or less immortalises what they're trying to get away from.
Would've made more sense to bite the bullet and launch with a ".litert" format which is identical to ".tflite", but continue to work with the later. That would remove the conceptual integrity issue without breaking any compatibility.