56k Hmmm, perhaps we have different definitions of setup bait, because using the pokemon calc's set (gravity + 3 special attacks is still my fav), I found these.
252 SpA Life Orb Landorus Hidden Power Ice vs. 4 HP / 0 SpD Latias: 127-151 (42 - 50%) -- guaranteed 3HKO after Leftovers recovery
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 252 HP / 0 SpD Milotic: 188-224 (47.7 - 56.8%) -- 37.1% chance to 2HKO after Leftovers recovery
252 SpA Life Orb Sheer Force Landorus Psychic vs. 4 HP / 0 SpD Mismagius: 147-173 (56.1 - 66%) -- guaranteed 2HKO after Leftovers recovery
Claydol and mantine both hard counter lando-I as long as they are running ice beam, they can comfortably take a psychic, sludge wave, or even a gravity EP and KO back easily with ice beam or attempt to setup.
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 252 HP / 252+ SpD Claydol: 144-172 (44.4 - 53%) -- 0.4% chance to 2HKO after Leftovers recovery
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 252 HP / 252+ SpD Mantine: 130-153 (38.9 - 45.8%) -- guaranteed 3HKO after Leftovers recovery
Or not... As this illustrates, trying to setup in front of an offensive threat like lando-I is dangerous, you are basically banking on the opponent feeling threatened by a possible ice beam and swapping out, giving you a free turn. If gravity is up, lando-I cleanly 2hkos all of these, and even without gravity, it can still nail most of these guys pretty hard.
For the record, all these mons except mismagius can and prolly should carry ice beam, meaning that they can comfortably swap in and ohko.
So to reiterate, lando-I is NOT setup bait, also, many garchomps nowadays carry iron head to nail clefable, and a lot of clefables don't appreciate STAB EQs either. Talonflame is only setup bait for ttar is he's locked into a move besides u-turn, otherwise he just nails ttar with u-turn (though he may take some heavy pursuit damage in the process, but one cannot use pursuit and setup at the same time, so tflame is still not setup bait). So like I said, true setup bait is very rare due to the large number of pokemon capable of sweeping a considerable fraction of the tier with a mere one turn of setup, and regardless, lando-I is NOT setup bait.