you could maybe show some testing? if that's true, then it should be measurable
Test yourself, they link to their site from their profile and it's definitely delayed. https://twitter.com/nytimes
Leaning towards there's something else going on deep in the DNS/ad servers/cdn/who knows. Not the first I've seen/heard of resolving delays with t.co... maybe it's even just something with legacy non-SSL links being redirected etc