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I have only seen Stinger gunner in the prone position never in the kneeled position.
Yes, it is a Stinger. You can't fire them from the prone though. They are normally fired from a standing position.

They can be fired from the kneeling position too, but up in the air at an aircraft, like this SA7 gunner is .

Like noted above, it doesn't do well when fired horizontally or at ground vehicles. Since it is a heat-seaking missile, it will not normally lock-on to a ground vehicle since they don't have a large enough heat signature. Also, they have a proximity fuse that explodes close to the target and throws shrapnel out to take out vital systems in it. They have no anti-armor capability.
In conclusion, yup, CMK got it wrong.