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CPR is mostly an emergency intervention to keep someone critically ill (from trauma or other acute medical emergency) alive long enough to get them to the ER.

If someone needs CPR at all, the chance of being able to fix the underlying cause of their cardiopulmonary arrest on a space station is infinitesimal.

I agree CPR in that situation is probably limited value. I bet you can find their procedure manual online, but on station, the victim would only be a few meters from a defibrillator and drugs to fix the problem. The ER is some 12 or 24 hours away.
Sometimes, doing something common but with different conditions may be enough to trigger unexpected insights. Maybe it won't save anyone in space but we could still get new knowledge or tech that proves valuable somewhere else. Not claiming it has the highest expected value, just that it's not automatically useless.
CPR is a violent process - the rib cage normally prevents the type of manipulation of the heart necessary for CPR to work. Broken ribs are pretty much an essential side effect for adults if done correctly. It’s typically only done on folks who are dead and unresponsive at the time, to try to keep their brain alive until they can get more sophisticated help. The so called ‘golden hour’ (which really is the golden 15 minutes/5 minutes if you look at success rates).

What sort of response time are we talking about from the ISS in a medical emergency? I would be shocked if it was less than a day.

They’re probably better off with a whole lot of drugs, an ultrasound, and a defibrillator. But hey, if they can afford the weight and already have those things, a cpr machine would help keep blood flowing while they try to figure things out.

Ground control has Doctors that can walk them through pretty much anything they might want to do.

It's worse than that. The patient is forced by the compressions to vomit. In zero-G, that means the highly acidic contents of their stomachs are now several forcefully-ejected packets of goo.

Forget the dreaded conductive pencil-lead shavings; that stuff is going to cause problems to hardware and wetware alike!

Good point, also rather extreme aspiration risk probably? I don’t know how you would clear their airway unless you also had a suction device. Gravity certainly isn’t going to help.
So since weight is so reduced could you not grab the person who's unconscious hands and use your foot? I mean it's not ideal but in reality wouldn't CPR on earth be easier with machines too? It's not exactly an easy process if done correctly
Is this one of the final researches to be carried out in space beyond instruments in probes and satellites, considering they're going to let the ISS burn up?
It's a vaporware discussion by laymen. I can't believe a doctor would advocate using CPR when things like AED defibrillators are already handy.
High quality CPR includes AED usage. 30 compressions to two ventilations. After 2 minutes of CPR, perform a rhythm check with AED and shock if advised. There are existing robots that do chest compressions for you (Zoll AutoPulse, LUCAS). They would work in space I bet.

Source: I'm an EMT