No.
Hate to break it to you but, cultures of Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus are found commonly in animal gut tracks and manure as well.
The original yogurt strains from with all industrial yogurt is made was isolated from “naturally fermenting milk inside animal skins, stomachs and intestines.
All of those bacteria are gram positive and every one of them lives and thrives inside mammal species GI track.
So yeah about the air thing it’s a giant nothingburger compared to industrial fermentation processes. Humans have been using bacteria from the air, guts, manure, fish guts oh yeah two of the three above bacteria also love fish guts it’s how you ferment and make fish sauce same acid making bacteria. You take fish whole fish unguted or it won’t work, you put them in a clay barrel outside in Vietnam heat for THREE YEARS and let those bacteria do its work the only other ingredients is sea salt to pull moisture out and give the gut bacteria a chance to take over before e.coli does. Eat up big guy. Don’t even ask where beer yeasts or blue cheese, brie or stinky feet cheese get it’s cultures hint the last is exactly what
It smells like same bacteria on human feet and pits makes that cheese.