While the tips in that video are good, he blatantly has never played in silver/gold. I already do all the things in those videos and they don't make a difference because most of my team mates do not.
I try and combo ultimates but nobody communicates back. I give positive advice but it's ignored. I try and make intelligent picks but I'm forced to heal, often solo because people just wanna hanzo or widow. It's hopeless advice unless most of your team mates are on the same page which is rare as fuck.
Coupled with with the onslaught of leavers & hecklers deliberately throwing the game for the rest of us, along with trying to co-operate/work around toxic teammates, I agree. It's great advice. But without teamwork, you'll lose and get trampled, even if individually you play competently.