Why is the shadow of Ingenuity’s propellers so sharp?

A shadow, not only on the Martian soil, but also a shadow on the credibility of the data NASA is providing about it. With propellers that are supposed to be spinning at fantastic speeds to compensate for the rarefaction of the tenuous Martian atmosphere, how is it possible to take photos where the propellers themselves appear as sharp as if they were stationary?

Full article: https://ilpianetamarte.org/Files/Perche_l_ombra_delle_eliche_di_Ingenuity_e_cosi_nitida/Perche_l_ombra_delle_eliche_di_Ingenuity_e_cosi_nitida.php

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