^ For that matter, Exit 6 on the I-264 list is also at Des Moines Ave. The whole kit-and-kiboodle needs to be shifted over to 164.
As for the St. Paul Blvd point, yes that's in the correct place, since ALT 460 follows the ramps to/from 264 West and they do split. Officially, City Hall Ave only flows westbound there. Eastbound from St. Paul Blvd is ramps-only. Google Maps is incorrect in this regard.
The REAL question is instead whether ALT 460 still ends at St. Paul's & Brambleton or if the endpoint has shifted since mainline 460 shifted to Church St.