Tacos El Bronco?

The legendary Tacos El Bronco truck can be found at 5th Avenue at 43rd Street.  It's often open til seven or so in the morning. There's also a Tacos El Bronco restaurant at Fourth & 43rd.  I'm curious though, because the name sign on the truck here is missing, & they're usually not open this early in the day.  Some sort of change?