If the black hose was kinked, it could have reduced the vacuum to the turbo actuator, which would have reduced you’re boost. It wouldn’t have been done on purpose.

Personally, I’m not a fan of using silicon hose on the pressure side also because it has a tendency to expand and delay the boost signal to the Dawes and your boost gauge. Better to use some pressure hose on that side, but ok to use silicon on the vacuum side.