Two things about that.
1)You're not going to put such a cooler in a 'stuffy' chassis.
Any cooler is only going to be as efficient from what the chassis allows, and hybrid coolers are just as dependent, if not more so than air coolers, on good airflow.
Otherwise, the pump flow is doing the bulk of the cooling, and that alone isn't going to produce amazing results.
2)If you're considering Comet Lake with the intention of 'overclocking the crap out of it', then look to the 10600K for the most 'enjoyable' experience.
The 10-7 and the 10-9 do not have as much OC headroom - the 10-9 having next to none. Intel already pushed the envelope really hard on the last 2; you gain very little practical performance, but a crap-ton of heat.
If you've already seen some 10th gen temperature tests, there's something some of them miss, and that's how highly conservative Intel is with the power limits on these chips.