I think you are confused here, Delta's "updating their fare search engine" as you suggest, will not change a thing. What you experience here is different prices for the same product through different channels, which is perfectly normal. Sometimes you'll find the same price on the airline's web site and on the resellers, but in most cases (international in particular), you'll get different or VERY different results. And this has nothing to do with Delta not "updating their fare search engine". They simply ask for a higher price if you book through them directly instead of Orbitz. No need to call Delta's web site "delta.dumb". Delta's web site is not dumber than you are.
It's like a can of Coca-Cola that costs more at the gas station than at WAL-MART, and you ask the gas station to re-decorate their store. Your request makes no sense at all.
All the things you probably hate about travelling are warm reminders that I'm home