I saw what you wrote. And it doesn't change the fact that, if you put an infected lens in an enclosed space with uninfected lenses, you are increasing their exposure to spores. There will be a higher concentration of viable spores due to an active fungal growth.
You need suitable environmental conditions to turn the spores into a mushroom.
Fungus probably even dries out in dry environments.
I see this with lenses where small fungus stars are no longer active. The fungus also needs something to eat, and if there is none or too little, it dies.
Again, if fungus were contagious, my closet would already be full of moldy lenses, because there are definitely some that have fungus stars. But since my closet is not an incubator, there is no fungal epidemic.
You can't avoid the fact that the spores are everywhere.
Otherwise see Zeiss.