Interestingly, it appears to be propaganda only intended for internal consumption in former USSR.
That's minor PR event which likely purpose is to send some message to the West, while also delivering some "good news" to the audience of state TV. If you'll ask anyone in Russia, noone will remember it. Meanwhile, RS-28 is real and Russian Strategic Nuclear Forces do perform the upgrade of the whole triade at this moment.
I agree- weapons that actually exist are of far greater significance to this discussion. I just thought this was a better fit to the GP's original comment than the other suggestions posted.