No, the good part that you need is the yellow part. That's the plasma and where the platelets and growth factors are present.
The more clean from red (the more pure and clear the yellow is) the better.
Different blood preparations can do very different concentration levels of platelets. There are comparison tables out there where different machines and processes were tested.
I don't know what videos you been watching, but it doesn't make any sense to inject the red part... it's the yellow part that contains the platelets, growth factors and anti-inflammatory agents.