Not a keyless car then.
No it's not true and you can't start the car no matter if it's keyless or with key by just putting it into gear. If yours does this then it probably shouldn't.
Even if this is true (and I wouldn't know as I'm keyless) you've still gotta put the key in and turn it half way which is more hassle than pressing a button and I don't have to worry where my keys are. Plus you have the added benefit of just tapping the handle and walking away.