Yes but small amount add up quickly. especially when 2 abilities can stack. E+W can stack. So 3 auto's. W pick gold have E proc as well. Q, wait 3-4 auto 3 times Wait .5 seconds W pick gold have E proc Q. small amounts add quick. From just that with 100 ap and say 100 AD (to make for easy calculations. 2:30 am I don't wanna do math) level 9 BTW so Max Q, 2 in W, 1 E/R which is Q- 325 W 173 E 105 = 543. Factor in maybe 60 MR at most, and you drop 80 points. So 463 damage. Now you can get that rotation off twice in about 5 seconds (4 if you rushed 20% cdr) and the stun lasts 1.25s. So By the time the stun ends you are already at 3 stacks or close and W/Q is about off CD as well. So you Rotate again W+E stack and Q. Either brings them low enough the auto attacks finish them off, after or another Q will. That at the Minimum 926 dmg and max is 1086.
So you can see how that small amount TF does adds quickly. Level 9 TF if Max W is even worse to deal with as The W/E>Q becomes almost a perma stun due to the Stun lasting 2 seconds and the cooldown with 20% making it 4.5 Seconds. thats 2 seconds of time to run/Flash. If the TF has ghost, well you are screwed either way. Level 9 Uses Ult and well yeah no running.
See what I mean. He is an annoyance and can do a good amount of damage at Level 9 even with Low base values. His Scaling never dips below 50%.