It’s a really cool concept, though it’s not settled science: https://earthsky.org/space/is-it-true-that-jupiter-protects-...
It’s interesting to consider that a Kepler planet may also require larger mass planets further out to perform a similar role.
> The gas giant is considered to play a big role in protecting the inner solar system from asteroids and comets by attracting and absorbing impacts or flinging potentially dangerous objects further out into the solar system
It's fascinating to think how many factors have come together to make life on earth so particularly viable. Even with this "protection" we've had major catastrophic events that nearly wiped out all advanced forms of life.