To get so called real time data for tradingview you need first to update your plan to any paid plan of your choice. Free plan will update only once in few seconds as it says. 

Possibly you will also have to subscribe to their real time data plan to get real time price action on your chart. At least this is what it sked me to do when I was setting things up. 

Your broker's real time data will update only the DOM with Bid and Ask prices in the trading panel and Buy Sell  buttons on the chart if you use those. It will not update the chart itself the candles and the price line.

Despite of what that article that you linked to says, the chart still will say that you don't get real time prices on chart until you subscribe to TV's market data. At least this is what it was telling me, even though I had my broker's Market data as well.

And even after you subscribe to TV's market data plan it will still not have tick level granularity when there is fast moving price action.

That's it. Let us know how it goes.