Sure, it's a contributor, everything is a contributor. But the main thing is that young men aren't dying like they used to in the past. That's the primary mechanism skewing gender fertility ratios. Sex selective abortions are relevant in some countries to some extent, but globally are almost nothing. It's a red herring.

When you have 5 extra boys born for every 100 girls the default position is there are more reproductive aged men than women. The fact we haven't had that has been because young boys and men disproportionately died compared to young girls and women globally. Modern medicine, laws, and general peace in most of the world has stopped that trend.