For anyone confused on what the "Spencer glitch" is, it still works on Arthur and Joe. This is how I went about testing it on Arthur in Training:
1. Picked Haggar and Spencer, with Haggar on point, and set the dummy team to Arthur/Joe/(Random).
2. Used Haggar's air down C to ground bounce Arthur.
3. Delayed Haggar's projectile motion Super so it connected right before he fell out of range.
4. Canceled into Spencer's DP Super on the 4th hit; the idea is to bring him as close to the ground while still in hitstun without letting him land.
Done right, Spencer will continue his cinematic, but Arthur will be stuck in the ground and won't take further damage from the rest of the combo (I'm assuming his hurt boxes stay with his character model). After about 4 seconds, Arthur spirals into the air as if you launched him and goes back to his non-glitched state. Joe's the same, but rather than doing it before he falls, you need to keep him high off the ground.
This reads complicated, but notated, it's just air down C, QCF + 2P, xx DP + 2P. The only complex part is the timing. There are bigger combo lead-ins for Haggar, but if you just want to do it yourself, the pipe's the easiest way into it.