But it would still take way less than 10000 years to cross the heliopshere boundary (it took 40 years for the Voyagers probes). It is probably referring to the

But it would still take way less than 10000 years to cross the heliopshere boundary (it took 40 years for the Voyagers probes). It is probably referring to the gravitational sphere of influence of the solar system (marked by the Oort cloud) 1 to 2 light years away.