Yes. The flicker is a real issue. You can use software to try to fix it in post, but it doesnt always work. Its worse if you do any speed effects (slo mos, etc).
There are things your cinematographer can do with shutter speed to minimize it, but I’m not a camera guy. I think you can find the answer with some google searching.
Don’t ignore the problem until its too late. People shoot “NTSC” in “PAL” countries all the time, so it can be done. But do it right.