According to the post, TTS read-aloud provides both cloud and local paths. On the cloud side, two models, Doubao Voice and Edge TTS, are added for reading articles and e-books; on the local side, a local small voice model is supported for real-time read-aloud.
The intent of this combination can reasonably be inferred as balancing quality and availability: cloud models usually depend on the network, while local models may fill in when the network is down. But the post does not explain the invocation method, quota, or cost of cloud TTS, nor does it explain the specific name, size, or operating requirements of the local small voice model.
In the comment section, user 0x小师妹 directly asks, "waiting for a specific name for the local model," and says that although running Edge cloud on an old machine at hand is stable, when the network is down they still want to use a local one to hold things over. This shows that the specific identity of the local model is an information gap readers care about, and the post does not provide an answer.