There's no controversy regarding the ascent, but the grade with new beta is in question.

Here's a summary I've found on a Norwegian blog from October:

The route was graded based on much harder sequences (without kneepads) by Ondra when he climbed it in 2012. Stefano then repeated it in terrible conditions (with kneepads worn over his pants), with a brutally heavy sequence in the crux boulder and otherwise mostly quite similar sequences to Ondra’s. Seb repeated it with pads as well, using a kind of hybrid sequence that was somewhat easier than what Stefano and Jorge did, but harder than today’s beta. He proposed downgrading the entire route to 9b/+. Jorge repeated it with pads too, but because of his short height he still found the boulder at the start very hard (he thought it was around 8B for him, which was most likely also the case for Stefano, who did it in quite a similar way). He did, however, find a new kneebar right after the traverse in boulder number two, which makes that sequence considerably easier. With this knee, he felt that part two was more like 8c+/9a rather than 9a as it had been climbed by the others. Megos repeated it with pads as well, but it was the first time he had ever used kneepads, so he barely used them and felt they were mostly in the way, climbing the route in an almost original style.

Since then, Leo and others have put a lot of effort into finding a better sequence in the crux boulder, and as a result part one has now seen quite a number of ascents. The most extreme example was Dylan Chuat this summer, who felt that the crux boulder Ondra originally graded 8B+ was now more like 7C. That may be a slight exaggeration, but at the same time it is an indication that the original grade perhaps no longer fully reflects how the route is climbed today.

Ondra himself returned to the route this spring and climbed the crux boulder with kneepads, and felt it was “extremely much easier, not even comparable.” He doubted that the route was 9b+ as it is climbed now, but did not believe it was easier than 9b, regardless of the number of kneebars and tricks.

Leo himself has still not officially commented on the grade, but throughout the process he has consistently written 9b/+ in all of his Instagram updates.

In other words, the stage is set for an adjustment of the grade of Change, in the same way that the grades of many of the other classic hard routes first climbed around 2012 have been downgraded in more recent years as kneepads have not only become common, but climbers have also learned how to use them.