>>281685928
Yoshida knows hybrids are not affected by Devil contracts that are specified to work only against humans.
He was right there to witness Denji being completely immune to the Doll Devil's power.

>>281646591
It's well-established by now that powers that only work on humans, won't work on hybrids. But that's of course only apparent to the people who actually read the manga instead of writing their own fan fiction of it.