I don't think that was the intent of the statement. Read it again. The Hummingbird chip can't compete versus Snapdragon when it's tied down by Android 2.1... that was the point.
With 2.2 the Streak is competitive with other 2.2 devices. There is no surprise there, given that it runs essentially the same processor as the Nexus One.
I have both devices sitting on my desk here, so I ran a comparison. As I suspected, they are close. Also note that the Dell Streak's resolution is much higher and I'm not sure how/if the benchmark takes that into account:
Linpack (higher is better):
Nexus One: 32.94 MFLOPS
Streak 2.2: 33.373 MFLOPS
CaffeineMark (higher is better):
Nexus One: 5587 (rank 124)
Streak 2.2: 5738 (rank 109)
An3dbench (no idea how scores stack up):
Nexus One: 4746, Fill rate = 10MP/s, Game level FPS = 24.87
Streak 2.2: 4495, Fill rate = 17.65 MP/s, Game level FPS = 32.26