I just searched for the bacteria mentioned in the article and it seems that you can simply BUY that online and even many other types of bacteria. Here's a link for the curious https://www.swansonvitamins.com/swanson-probiotics-lactobaci... I am in no way affiliated and recommend looking the company and products up.

Anyway I've a severe allergy against figs and hope I can one day eat them again.

I have never heard of these kind of bacteria and thought that probiotics is a scam in that it replaces your gut bacteria with ones that are genetically modified so that you "feel" bad without re-consuming them. I think it sounds crazy, while being in the technically possible realm with no law against that.

I had very serious pollen allergy which was greatly alleviated by immunotherapy. Nearly 5 years of regular shots though (initially weekly after that eventually biweekly, then finally booster shots at less regular intervals). Since some pollen and food allergies seem to cross-react it also impacted the severity of my food allergies.

Immunotherapy can work for allergies in general, but for non-food allergies is quite inconvenient (several shots per month for years)

Posted above as well: https://www.oit101.org/