This is an improvement as it provides better data and has nothing to do with the models that are used in a separate step to forcast anything. But that is said in the article as well, with the satellite being the first hyperspectral view on Europe and North Africa.
I am not sure what to make if your question.
Been pulling in some of the newer data and concepts from open-meteo to my home weather display specifically the ensemble data, helps to provide some level of spread over the forecast, I mean I am not that sure how useful it is but I kinda got used to reading it of the display.
https://openmeteo.substack.com/p/ensemble-weather-forecast-a... https://open-meteo.com/en/docs/ecmwf-api https://open-meteo.com/en/docs/ensemble-api
> I am not sure what to make if your question.
They are asking for a quantification of improvement. "better" predictions could range from "only experts notice" to "the daily/7 day weather is now noticeably more accurate for all citizens of Europe".