My recommendation is to buy an RPi, SD card, and Mater devices as much as possible.
Voice is possible on Home Assistant and it will only get better. The devs, like many of us, prefer privacy and local control/storage.
There's a way, it's just not the path the author chose. The better path has only come about in the last year or so, tho.
Fwiw: you can tie the voice stuff into OpenAI and ask questions. It's no longer local and each query costa fraction of a cent... But if you feel like you need that, it's there.