Might be the case, however one cannot assert 100% guarantee.

What you can do is look at the casualty rate per year and see how it went from hundreds in the 90s post-war period, to dozens throughout 2000s, to 0-1 in recent years and calculate your likelihood. Here's that chart for Bosnia: https://en.wikipedia.org/wiki/Land_mines_in_Bosnia_and_Herze...

I lived along former front lines my entire life, I spotted some unexploded ones with my own eyes a long time ago, I'm not dead yet. That said, I am more equipped to handle such situations than you are, as I was taught how to do that since my first days in school. I firmly believe that outsiders are frequently overreacting these days, which is completely understandable, but that doesn't mean it is rational. Your odds of winning a lottery are infinitely higher than dying to a landmine in the few days you spend here. You can increase them by doing something stupid like avoiding those markings, but besides that you'll be fine.