He mentioned accuracy, not recoil.
and he's right. The Harrier is a superior weapon to the Lancer.
All guns are Platinum viable. That doesn't negate the fact that some are just better than others.
I don't understand the gripe with the Lancer's accuracy.... Is it perfect? Absolutely not... Can I land all of the shots from it consistently? Yes.. and I have lolConsole aim.
Once you figure out a gun (In ME3) inside and out, you understand all of it's strengths and weaknesses. I have no issues with the Lancer's accuracy and recoil, I can do better with the Lancer than the Harrier on a consistent basis. This is coming from someone who has played since the demo, and I've used the Harrier a lot more than the Lancer.
By the way, the Harrier is phenomenal. Sustained DPS vs. Burst DPS is what comes into question here... and when you roll U/U/P for the majority, ammo can be a problem.
I know I'm coming off like a complete p.rick, but in reality here; if you know how to use either of these weapons, you can rock any faction on any difficulty. They're both great.