He did provide high level detail. He said he'd use tariffs to exclude foreign made stuff, which will necessitate "made in America" and bring manufacturing back. He said he'd balance the budget, which (theoretically) has long-term effects. He said he'd deport illegals, which should reduce demand for housing and hence prices.
You can disagree with any of those things, but I don't think it's right to say he didn't offer anything specific.
I mean; he offered 'specifics' - they simply didn't make any sense on cursory examination. How to fight inflation? Tariffs! How to make already expensive goods cheaper? Tarriffs!
Hell, re: deporting illegals, he didn't even bother to do that his first term, Obama did it at a dramatically higher rate.
It's all a "I'll fix everything by doing nothing" smokescreen.