I have been playing a lot of T. Hawk since Super came out and I can say Sim is no doubt a hard matchup for T. Hawk.
Unlike Gief, Hawk cannot reliably score knockdowns to close the gap and make Sim’s life miserable. EXGH is a fantastic tool that gives Gief a ton of mobility and makes him super dangerous. EX GH basically prevents Sim from doing anything unless he’s perfectly spaced and Gief can just bulldog his way forward to push Sim into the corner.
Hawk has nothing of the sort; he only has Condor Dive which is probably the most unsafe move in the game on block.
Sim can punish with U2, as mentioned, and he can AA with U1 (even though he’ll likely get hit too). He can try whiffing it / crossing up with it, but it’s hard against Sim because he can poke T. Hawk out of the air easily since his jump is so floaty. And, unlike other match-ups, he cannot whiff jab condor spires to build meter because Sim can punish. Still, Condor Dive is T.Hawk’s best tool in this match-up because he does deter Sim from throwing out reckless Yoga Fires or st. Fierces, even from full screen.
Also, Gief can combo into a knockdown off*a hit-confirmed jab or short whereas T. Hawk can mostly just follow up with jabs to st. Strong. His jumpins are not as good either. Other than jump down fierce (splash) most of his aerial moves have very few active frames so he’s easy to antiair , unlike Vanilla Gief who had some very low hitting, long lasting jump-ins like j. fierce or j. forward. Hawk can set up an ambiguous cross up with j. strong, but it has to do it really deep; if he does it too early it’ll whiff: either way Sim can AA easily with b. RH or b. strong. His jump is so floaty that empty-jump shannigans ala Gief are also out of the question. And he has no short jump (that I know of). He lacks Gief’s insane option-select flowchart options too (as of yet; he might have some godlike OS we don’t know about, but that seems unlikely according to people like UltraDavid).
That doesn’t mean he’s free though. He has insane damage out put: cross-up splash, cl. strong xxx EX spire, juggle into EX Tomahawk, EX CD does about 450 damage which is 50% for Sim. His jab Typhoon doesn’t do much damage, but it sets him up right next to you for a mix-up. Whiffed Condor Dives are super dangerous too, though Yoga Tower might be interesting in this case.
In my scrubby opinion, the matchup is 6-4 Sim. It might change in Hawk’s favor as the character develops though. Who knows.