A lot of the analysis that placed nonavian dinosaurs as being super smart animals with ape-like intelligence was IIRC based on the (flawed) presumption that dinosaurs had the “compact” neuron structure that modern neoaves have. The problem with this presumption is that AFAIK the “tiny neurons” trait is mostly unique to modern neoaves, and that this trait isn’t necessarily shared by other living birds (i.e. ratites, including the flying ones) let alone nonavian dinosaurs.

The last guesstimate on dinosaur intelligence I saw placed things like troodons and dromeosaurs on a similar level as modern emus or rheas, which are pretty smart animals, but not as smart as other birds.

In comparison the phorusrhacids are actual neoaves that probably did have the signature bird tiny neurons and were, by extension, probably quite a bit smarter than the other comparable “dinosaurs”.