Hong Kong stocks are not.
Hong Kong shares, as the name implies, are trading, priced stock assets.
Because the Hong Kong Special Administrative Region adopts a special system – the linked exchange rate system, the Hong Kong dollar and the US dollar basically maintain a fixed exchange rate.
Therefore, the fluctuation will inevitably bring about the same fluctuation in Hong Kong dollar, and the Hong Kong stocks traded and priced in Hong Kong dollar will inevitably be affected.
But Hong Kong stocks cannot be said to be because, although the Hong Kong dollar is pegged to the US dollar, it is, after all, a different sovereign currency, and the Hong Kong Special Administrative Region government could, in theory, decouple it from the US dollar at any time.