does it mean uncontrolled severe deflation/inflation is more likely to
occur compared to "normal" currencies such as USD, EUR etc?
Look at the chart referenced in the link in your question. It took approximately 50 years for annual production of gold to double from 500 tons to 1000 tons. It took approximately 40 years for annual production to double from 1000 tons to 2000 tons.
Compare that to the production of US dollars by the Federal Reserve (see chart below obtained from here). US dollar production doubled in DAYS. Which one do you think will lead to uncontrolled inflation/deflation?
Update: Why did I include a chart of the FED's balance sheet? Because this is the way newly printed money is introduced - the FED will purchase something from banks (mortgage-backed securities, US treasuries, etc.) with newly printed money. The banks can then loan this money to people who then deposit the money into other banks who loan those deposits to other people and so on. This is how the fractional reserve process expands the money supply. This is why I did not include a chart of the money supply since that is counting the same money multiple times. If I deposited 100 newly minted coins into a bank and that bank proceeded to loan out 80 of my coins where 80 are deposited into another bank who then proceeds to loan out 60 of the coins, and so on....the production of coins only changed by the initial 100 that I minted - not by the fractional reserve multiple.
There are historical examples of inflation with gold and silver as duff has pointed out. None of them come close in magnitude to the inflation experienced with government fiat money.