This is nonsense for two reasons.
Pater Edmund has forgotten more about Christianity than you know, so dismissing it as "nonsense" is not a good look. You may disagree, but the material you're arguing against is so thoroughly supported (with citations) by the magisterium that you'll likely find yourself outside the Church if you're successful.
1. It ignores natural rights.
It does not.
Here's a brief introduction to the concept of right, and
further notes on right and law.
2. Economic liberalism has lifted more people out of poverty than any charity or social program ever has. Even if we abandoned natural rights philosophy, we'd still want economic liberalism on utilitarian grounds.
Economic liberalism is distinct from technological progress, and there's not a lot of evidence indicating that one requires the other. Most of the improvement in our material standard of living is due to advances in agricultural science/ improving crop yields. But if you couldn't go on living without a
massive variety of Oreos, and other sorts of vulgar consumerism... then you're right, we've got to stick with economic liberalism.
You've basically deified the Invisible Hand, attributing to it everything that is good in society. Any and all evil is the result of lazy humans or an incompetent meddling government, never inherent to capitalism itself. I think much of what you credit capitalism with properly belongs to Christendom-- Greek reason, Roman law and Christian theology. Since capitalism is itself the application of
Protestant ideas to the market, it would all be inconceivable without Christendom anyway.
So economic liberalism is superior in two ways, and they're self-reinforcing. Principles demand it even if it doesn't produce the best outcomes, yet it also produces the best outcomes regardless of principles.
How are you measuring "best outcomes"? And are you aware of the alternatives (hint: it's not just communism and fascism.) Liberalism is really good at offering nearly unlimited choice when it comes to empty calories, meaningless distractions, and flimsy wares... but when it comes to the stuff that really matters, there's no real choice. "Don't like liberalism? You must be a Marxist Nazi! Interested in political change? Too bad, because your only options are two different flavors of the same shitty ideology, etc."