What do I make of that?
I'd say it will work on a 4cyl, free up a few hp there.
However, on the 1UZ, with its increase capacity, and thus torque, and increased moment of intertia (I think that the right term, basically increased rotating mass), you will notice a very very small increase in power.
Take a 4cyl NA, putting out 160hp.
I can see maybe 10hp from a smaller pulley, so 170hp.
Thats a 6% increase.
Take the 1uz, putting out 280hp.
I honestly can't see more than 5hp, but lets assume it does get your 10hp.
Thats only 3.5% increase (1.8% @ 5hp).
I don't think you'll notice 3% increase on a 1UZ.
You'd be getting more drivable results from a better cold intake, or a freer exhaust.
Its a pity you stock guys can't dial in a few more degrees of timing, and run a higher octane fuel. Because that would definately net you 10+hp.