Headline is typical narrative molding, "freeze Russia's gold reserves." As if they won't allow Russia access to her gold, implying they somehow control it.
Russia's gold reserves are held in Moscow, St. Petersberg, and Yekaterinberg according to this: https://www.rbth.com/politics_and_society/2017/02/01/where-are-russias-vast-gold-reserves-hidden_693531
So the only thing the West is supposedly blocking are TRANSACTIONs in whic Russia would pay by gold. Which I doubt they would do anyway.
They can, however, demand payment for their gas in either gold or Rubles, thus adding to their financial security.