As said, proving the non-existence of something is difficult.
With 100 tries at 2% chance each try, you have about 87% chance to get at least one SGL
With 5% each try you'll have about 99% chance to get at least one SGL.
I'd say the chance you just had bad luck in this one test is still fairly big, at least if we assume its always 2% chance with good huts.
You'd need 250 tries to get to 99% chance of at least 1 hit with 2% per try.
I'm assuming you un-checked "save random seed" of course. (you didn't mention it, so I bring it up, just to be sure)
That said, adding my own experience to it, I'm pretty sure you don't get SGL from goody hut techs.
A test that involves a saved seed (so you can save the proof, if you find it) can be set up to:
Just create a game with huge map, 60% water, pangea, sedentary barbs, 5 billion years, dry and cold, and play an expansionist civ in chieftain difficulty. (with only one civ, you, and all victories turned off to avoid auto victory) These conditions provide a map with lots of huts and land with the least obstacles that slow down your scout.
Set SCI to 0% and pump scouts, pop all huts, note how often you got a tech.
When you popped all huts, or all AA tech (whatever comes first) Generate a new game with the same settings.
Note that if you pop a tech, it will always be the cheapest available to you, except the one you are currently researching, (even if you generate 0 bpt) except again if that happens to be the last available tech left.
Once you reach the MA, all tech popping stops, including any missed optional techs.
To get all AA tech, make sure you set research to a non-optional tech each time, to ensure you'll pop all the optional ones before you end the AA.
There are 21 AA tech, you'll start with 2 so there are 19 chances to get a SGL each game. So you'll need about 13 or 14 games to get to 250 tries.
I've tried one game that way: Played the Inca to make mountains and hills easier and had AP on too.
Deserted 4
25 gold 8
50 gold 3
City 7
Settler 1
Tech 19 (of course)
Warrior 7
Horse 1
Map 9
And I still had lots of huts left. No SGL from the tech though.