There are many articles about this. Or qeustions and answers like https://english.stackexchange.com/questions/4325/using-that-and-this-interchangeably
The TTS source has changed. There were some problems with the old voice, and there are come problems with the new voice. I've listened to the sentence several times on both the regular and slows speeds; the slower pronunciation sounds clear, at least for my speakers and my ears. This sometimes happened with the old voice as well.