I found it odd they didn’t show Numark hardware in the Numark ad.
It’s the bigger picture that’s more important.
Engine DJ
If a newbie DJ can’t afford a Rane System One with Engine DJ onboard right now, they can buy a Denon DJ Prime with Engine DJ onboard …. If they can’t afford a Denon DJ Prime with Engine DJ onboard right now they can get a Denon DJ Live with Engine DJ ….. if not, they can get a Numark
Maybe next year, if they can’t afford Engine Day on a Numark, they could buy Engine DJ on a Stanton DJ all-in-one
The ad is simple engine dj:s ad, and at the moment the RS1 is the flagship model of the ecosystem. So it is totally logic that it is this unit in the ad 
The thing is I recieved four ads. One branded as Engine DJ, one branded as Numark, one branded as Denon, and one branded as Rane. Each ad was the exact same except for the brand name. I just feel if they are going to promote Engine under each brand, it is lazy not to swap the picture featuring each brands hardware.
Yes, technically that’s false advertisement but most likely what you said in that they’re just being lazy and didn’t create a new and updated visual.