Concept art isn’t gospel. Just because a piece of concept art exists does not mean it was ever going to be in the movie. That said, the next best thing to seeing something in a movie is seeing it realized in concept art, and a very cool beat conceived for the end of The Rise of Skywalker will certainly bring a smile…
Source: io9 – See Rey Flex Her Jedi Muscle in this Rise of Skywalker Concept Art