The headphone icon indicates a title for which you have an audiobook companion. It has nothing to do with TTS/VoiceView. It means you can download the audiobook and listen to it as well as the ebook (though not simultaneously), and reading position is synchronized between the two formats. VoiceView is not restricted to Kindle Store books.
All 7th generation and later Kindles support VoiceView screen reader for all titles that are not fixed layout. TTS restrictions do not apply. However, it's not as convenient to use as TTS, as it is designed for people with vision impairments (for whom it works very well).
The last Kindle to support TTS was the Kindle Touch (4th gen I think?). Currently, the only devices that actually support TTS for Kindle books are the Fire tablets.
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