Yes, I can see it in the weapons editor list. I checked the article that you linked. I don't know if the coding is a bit different in SF2, but mine in WOV didn't have a Diameter limit or Load limit.
Here is what was in my F-4C_DATA.ini
[CenterlineStation]
SystemType=WEAPON_STATION
StationID=5
StationGroupID=6
StationType=EXTERNAL
AttachmentPosition=0.0,0.37,-1.01
AttachmentAngles=0.0,-2.0,0.0
LoadLimit=2050
AllowedWeaponClass=BOMB,LGB,NUC,GP,LP,IFP,DLP,MER,RCN
AttachmentType=NATO,USAF
ModelNodeName=pylon_centerline
PylonMass=32.21
PylonDragArea=0.02
LaunchRailNodeName=
MinExtentPosition=
MaxExtentPosition=
And, here is the SUU-16 entry in the Weapons Editor:
[WeaponData326]
TypeName=SUU16
FullName=SUU-16/A Gun Pod
ModelName=SUU-16
Mass=772.010010
Diameter=0.560000
Length=5.050000
SubsonicDragCoeff=0.200000
SupersonicDragCoeff=0.770000
AttachmentType=USAF,USN
SpecificStationCode=
NationName=USAF
StartYear=1965
EndYear=1975
Availability=1
BaseQuantity=12
Exported=TRUE
ExportStartYear=1965
ExportEndYear=1975
ExportAvailability=1
WeaponDataType=3
GunTypeName=20MM_M61A1
MaxRounds=1140
MuzzlePosition=0.000000,2.881000,-0.033000
LightPosition=0.000000,2.900000,-0.033000
AimDirection=0.000000,1.000000,0.000000
EjectShells=1
EjectPosition=0.319000,-0.171000,0.000000
EjectVelocity=1.000000,0.000000,-2.000000