As ostheer, if you don't have a pak out he drives into your base, kills all your squads and takes your MGs while also capturing the entire map, which is game over. Unless you're suggesting getting 7CP for the puma in 6 minutes...
Just stand in the arc of your base machine guns and those will kill his halftrack.
I've killed flame halftracks in my base with just infantry before, same tactics work here.