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Shimano stuff being sold as Shimano with model numbers etc. listed is usually OEM lines that were intended to go to manufacturers, not be sold directly. Legit parts but grey market. The fake stuff generally doesn't name the part it's copying but it'll be obvious from the pics or there'll be a part of the name in the description.
https://www.aliexpress.com/item/BR-BL-M315-m315-bicycle-bike-mtb-Hydraulic-Disc-brake-set-clamp-mountain/32787944708.html?spm=a2g0s.9042311.0.0.803b4c4dvusB5j
If you need some hyro discs for flat bars and dont need MTB stopping these are a pretty great deal at under £30 posted