In reference to the patent: WO2017151684A1 (Patent 1)
I think that it follows the same process as described by patent US5854056A (Patent 2) from 1997 and titled Fungal cell wall production and utilization as a raw resource for textiles by William J. A. Dschida
The only difference is a tricky use of the language by patent 1, instead of using the definition hyphae as patent 2 for branching filaments of fungal cells in liquid media, patent 1 calls them planktonic cells. The downstream process is exactly the same; inoculation of this liquid culture into fresh growth media and incubating it undisturbed to form a biomat.