How we can determine BTC is digital gold?BTC Thats can be determined by their attribute. Gold is valuable because it's rare and has a limited supply. This term is true for Bitcoin as well. Both can be exchangeable with essential goods and they are acceptable in our society. Gold and BTC both can be stored though they have different methods to do that. But if you compare these criteria then we can say Bitcoin is digital gold.
You pointed that Bitcoin is digital gold. I don't support this statement though both has some similar nature where gold price can be considered as stable and Bitcoin price isn't. Currency and a product cannot be compared within a same way. So I want to say that Bitcoin is Bitcoin which is a digital currency and gold is gold which is a product to use.