Teching out of airdodge is also possible Smash 4, it's just more notable in Ultimate since it has directional airdodges and a longer tech input window. This is how it looks on Smash 4 if you increase the tech input window to 14 (possible value for Ultimate)
without mods in Smash 4 you can only do it during the first 7 frames of airdodge since the tech input window param is 8
due to me pressing R way too early than I should this is usually how I pull off most of my techs
