Sounds like he read Nathan Latka's book.
Or it might even be Nathan. If it is Nathan, then you might want to watch out.
I don't have a problem with what Nathan does. It's on you to determine your value. I agree someone has to make decisions but that doesn't mean equity should go 60/40. You can have a decision-maker with an even split of the equity which is recommended by Y Combinator. Or make it 51/49.
It doesn't sound like you'll make money without help and it makes sense that help would cost something. Some money is better than none so I think there's an opportunity here. Just make the deal you want saved be willing to walk away.
Just because you got this offer makes me curious about your app. If you want a counter-offer, DM me and I'll look into it. If I'm interested the equity split would be 50/50. My background is marketing and IT.