I had a heart attack in December last year, although I didn't need CPR so can only say how it was for me. My artery was furred up and I had a stent fitted.
I'm twice his age but my job was nowhere near as physically demanding, I was advised to finish work if i could afford to.
I can't see him playing again for the sake of his health.
just a massive relief he's survived it.
A cardiac arrest is completely different from a heart attack though.
Heart attacks are blockages which restricts blood flow, which eventually results in a heart attack through the lack of supply (restricted supply to the heart).
Cardiac arrests are when the hearts natural rhythm is disrupted, leading to basically the heart having an irregular rhythm basically an uncontrollable spasm. Those people often are young and fit, and without a defib often people can be dead in minutes from that (people don't generally survive 3-4 minutes without CPR + a defib).
Luckily he was in a stadium full of medics.
I think it's unlikely he will play again though.
Hope you are in good health after your heart attack.