FIDE masters are somewhat better at solving problems than untitled players but not a lot. Most of the best problem solvers in the world are untitled for problem solving is a skill all by its own. Some problem solvers travel around the world to visit solving tournaments and train for hours per day in their discipline. Just like the GM-circus or the tennis circus.
Btw, the problem is a beauty!
wow this was most likely the toughest puzzle I ever solved!
Ive seen this before