If you're talking about civilian work, very few would know the difference or care about the distinction.
Nor would it change his work experience/training received.
So no, no real effect on resume.
You'd be surprised at how many employers do
understand and care to know the difference, and I wasn't seeking out people that hired military members/veterans.
I've had (potential) employers ask me what my rank is, and when I'd mention Corporal, many of them understood that it's not necessarily a leadership position and I received a resulting "Oh, I see...".
Some also understand that while you can obtain a leadership qual, it doesn't always mean you're actively employed in a leadership position. Just like some organizations can allow you to take a Working Leader/Frontline Supervisor course, but it doesn't necessarily mean you are one.
So, for some, the Leaf can make a difference.