LAU-129 and 16S210 are both legit pylons.
the 16S210 can only be used for carrying AIM-9s (not sure that 9x) where the 129 can carry AIM-9s and AIM-120.
therefore the 16S210 is being phased out on the USAF, however, it is still very commonly used in other airforces. so saying “it’s not realistic” is a bit harsh.
however, there are some inaccuracies in the way the two launchers are used. let’s hope it will big corrected to the next version. 😉