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I call bullshit. The species of fungus that caused the Irish Potato Famine was Phytophthora infestans.

However, the is no modern strain of this fungus that is the same as the one that caused the Irish famine, that strain is thought to be extinct.

Although some fungicides were indeed banned in 2014, there are others still avaiable.
Apparently it's not even a fungus!
Late blight of tomatoes is the result of Phytophthora infestans and is notorious as the cause of the Irish potato famine during the 1800’s. Although it shares some similarities, P. infestans is not a fungus nor is it a bacterium or a virus, but rather belongs to a class of organisms called protists. Sometimes referred to as water molds, protists thrive in humid, moist environs, produce spores and spread when water is on the plants foliage. They may afflict plants from spring to fall depending upon favorable weather conditions.

Read more at Gardening Know How: Are Blight Infected Tomatoes Edible? https://www.gardeningknowhow.com/edi...d-tomatoes.htm