Is rating on chess.com similar to rating in lichess? The article mentions 1%, but you start with 1500 in lichess??? If you lose often, you quickly go down. But if you keep an even record, you stay in 1500.
I don't understand how people learn from slamming blitz/bullet games.
As in the article, speed training helps recognizing patterns and dealing with them. At first it seems impossible to play significant moves with so little time, but you can try to just doing it. You'll adapt very soon.
I recommend starting with blitz 3+2 and later bullet 2+1. There are tournaments of 1+0... or even less time. 30 seconds is really crazy.