Irrelevant. People saving money in volatile fiat currencies e.g. the Turkish Lira are still "saving" money.

Bitcoin is money. So it's saving. In Bitcoin jargon we could use the word "stacking".

But "investing" is objectively wrong. "Investing" means you want something to become more. This isn't what Bitcoin is designed to do. And people using this word are embarrassing themselves by demonstrating that they still think in a fiat mindset or haven't understood what Bitcoin is about.