Cost savings often benefit sustainability. You probably heard the "reduce, reuse, recycle, in that order" thing. The "reduce" part also reduces costs.
Here it looks like there is one less part (the silicone ring), which I believe makes it cheaper to build, cuts on supplies (no more need for silicone), and improves recyclability, which is good for the image and maybe some regulations. I don't know how good it is at delivering ketchup, but if it is as good or better, then we all win. Granted, it is still disposable plastic, but I don't see why that design would be unsuitable for a reusable bottle.
Exactly the kind of R&D I like.
So do the shareholders. Less cost == more profit.
Effectively this news story can be reduced to 'Plastic lid swapped for new plastic lid which makes company more money.'
Its not cynical, its the truth.
Maybe the same push is not present in the US, but creating a new cap for European market makes sense. Also using the better cap across the whole world to save costs makes sense again.