A car can be a prundler even though it might not have the traditional automatic transmission with torque converter. Any DSG, CVT, Hybrid that has a fully automatic mode for changing gear is a prundler.
Any car (usually electric) with fixed-ratio transmission is also a prundler.
To not be a prundler a car would need at least two forward gear ratios that can only be selected manually.
From PRNDL -> PRNDLer -> PRuNDLer
Would you believe it, that Peugeot 407 is a prundler, look inside!
So there I was trundling along in my prundler...
(refering to the car part)
The prundler in my car is broken and now its stuck in reverse