Since fixed targets might be better served by non time critical delivery platforms like bigger missiles on ground launchers, taking their sweet time to come to a specific location in china and strike, and since this is after all a naval aviation bomber - i will assume the missile seen is an anti-ship one.
With that assumption, just what are the implications?
Ground launched DF21d can already reach close to 2000 km off the Chinese shore. (lets not split hairs on exact figures)
This missile might be either of similar range potential, if it'd be ground launched, to a df21 or it's slightly smaller.
The fact it's air launched would add several hundred km to its range, over a ground launch. So its already at least on par if not a few hundred km (or even 500 km?) ahead of ground launched df-21d, range wise.
When one adds the location of the launch, happening anywhere from 200-ish km to 500+ km away from Chinese shores, the missile may have a reach of at least 2200+ km but also possibly 2900+ km, away from Chinese shores.
Now, the DF-26 antiship variant already has greater reach than that. So why is this missile even needed?
Possible answers:
DF-26 is for some reason too expensive, compared to other missiles.
DF-26 launch is too detectible by various sensors, as the missile is big.
DF-26 is simply in such huge demand for other roles (conventional strike on fixed targets) that there's no way to build enough of the antiship variants in a needed timeframe. Or even, if there's no dedicated variant, there are not enough missiles out there to be used against ships, as a steady barrage of missiles on fixed targets is set as a greater priority mission set.
Another set of implications. First with the DF-26 going well over 3000 km, and now with this missile plausibly reaching over 2500 km away from chinese shores, if the targets are ships, meaning objects that are quite relocatable - then having such missile would be a waste unless there was a way to reliably find and track targets. Which begs the question - has the Chinese confidence in tracking opponent ships' at such distances from Chinese shores (2500+ km) risen to such levels that we're now seeing a proliferation of such very long reach antiship missiles?