Forex Factory News Forecast

Hello Trader,

In this thread, I am talking about Forex Factory.
I was in a forex related telegram channel a few months ago and I see admin of that channel can forecast some news before release. He can forecast CPI, Retail Sales, NFP and GDP news.
I don’t know how he calculates that. He did not say the process but before the news, he said like USD will weak or strong or it will be a spike.

I can remember one thing only. That is GDP.

Earning+CPI+Retail Sales=GDP

He told if all these three results come positive then the next GDP result will be very positive.

I don’t know how to calculate that but I really need to learn that.
Anyone, know the process?

NB: I forgot that channel link. Maybe he removed me or he deleted that channel.

Thanks for your time.