Most gold ETFs don’t allow physical delivery for retail investors, rather they provide exposure only to the price of gold. Under gold ETF schemes, holders don’t own gold, they own interests in shares representing gold. If the stock market closes, investors do not have access to their gold ETF shares.
This, however, doesn’t seem to concern the vast majority of American who are content with paper or digital assets.
Gold, via ETFs (and Comex trading) has been transformed into another class of paper/digital assets.