They've altered Fusarium venenatum which is currently what Quorn utilizes in its products. "The production process of gene-edited MP is more environmentally friendly than chicken meat and cell-cultured meat." That's good news, if they get to the point where it is more economically friendly than chicken meat it will be great news.
There’s little chance that the statement is true. Chickens kept in a backyard can live on bugs and kitchen scraps and there’s no delivery cost for eggs or eventual meat.
Neurospora crassa is also pretty good. Meati sells slabs of it.