It’s not really so much “Entering” as it is showing off new models for your company lineup, but yes, anybody can post. If you’re going to unveil a car it’s generally accepted operating procedure to post a teaser before the press days and unveil the car on those press days.
It could well be nothing but mere coincidence - for starters, the cars shown in the teasers use different, rather than identical, bodies. The exterior colors are very similar, however, to the point that they are nearly indistinguishable.