The reason is that the developers are constantly working on the levels.
They make them heavier or improve them a little. For this you get
more boosters than before. And there are also certain events. Where
you can get boosters again.
Unfortunately King changes more and more levels, he reduces the moves, or changes other conditions. You can call it optimization. Some levels become a little easier, but sometimes more difficult. Try the reduced moves. It is always doable, even if it sometimes takes longer.
I was looking for a recent video, but unfortunately none has been released yet. The change must have been made recently.
The videos are only a kind of help. You have to try to build your own strategy to pass a level.