The range of this thing is of course oriented significantly for force multipliers, but there's nothing that inherently prevents it from targeting fast moving jets either. It's an energy and sensors game after all, and though this missile is respectively sized it's not much bigger than other long range high performance SAMs in the world which are also intended to target high performance combat aircraft at long ranges.
And PL-17 has the benefit of being launched from an aerial platform rather than ground.
Furthermore if it has attitude thrusters as has been rumoured in the past, that would also give it even more maneuverability.
Then there's also one of the original papers that described a concept suspected to lead to PL-17, which depicted a target set for the weapon... and well, see for yourself:
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