Who wrote this article? Rockstar exclusively does in-engine trailers, always have. The only people looking for evidence it's in-engine still are too young to have lived through past R* launches, to see the trailers vs. game comparisons where the game ends up better (except ped density).
if you're writing an article for the first time stop
if you're writing for second time get help
if you're writing for third time then please apply for mental asylum,you really need that .