Yes and no. He was very inconsistent with his jumper all season long even before fracturing his thumb. For his 3pt shots, he was only averaging 1.2 attempts before his injury and also ended up with 1.2 attempts at the end of the season. For his mid range shots prior to his injury, he was only averaging about 1 attempt per game according to NBA.com. He ended up around the same after his injury.
I noticed that there were games where he was automatic from the mid-range, but then there were other games where he choose to attack close outs and score inside instead. The stats don't agree with the eye test, but it did feel like we saw him more confident with his jumper early on in the season.
But in the playoffs? He didn't even look to take jumpers except for maybe 1 game. He was a non-shooter...but I don't think he was ever a good shooter before. His shooting is a concern, but it's always been a known concern. The Kings just have to live with it. Anyone expecting him to turn into Jokic from the perimeter might be doing some wishful thinking.