Yup, that's a ruined orgasm, and I did it many times. When I had one, 30 minutes later I was ready to go again. And for me, that is fast. Of course, ruined orgasms aren't nice, that's why they're called like that.
I think he's describing something different, and I think porn has generally confused what "ruined" means. What you're describing sounds like what I think is a real ruin, basically climaxing without any of the enjoyment. Stimulation stops just the tiniest bit too soon and you're past the point of no return, and you end up "finishing" without any of the pleasure or relief. So you get the "come down" hormone rush without the "that was fucking great" hormones, so it feels like shit, dick goes limp, refractory period sets in, but you're even hornier than before.
However, with practice (or maybe just genetics?) and stopping at just the right time (a bit before what would give you an actual ruin) you can also ejaculate without the climax or the hormone rush. Since you don't actually get the hormone rush, you stay hard and horney, and can keep going without a problem. Imo, when you see people cum over and over, I think this is generally what's happening. It feels dumb for porn to call this a ruin because nothing is actually ruined. It's really pretty great.
For the record, is this actually possible with any guys?
Real life isn't anime of course, but I can do this pretty much as many times as I want, pretty much limited by willpower (it gets harder to stop/hold back each time, and it's very mentally and physically draining, no pun intended). The first few times, I can do it just a few seconds apart, but it takes a bit longer of a rest each time to keep from climaxing. Each time is a bit less of course, but if having sex, I'll generally keep doing it until I'm completely empty, maybe 5-10 times (and I'm neither young nor in shape lol).
For me refractory period is really more horniess/willpower than ability. I probably could have sex again 10 minutes later, but I don't really want it yet. 30 minutes of cuddling later maybe though. Although if my partner wants to be all femdom-y, she can pound 3 out of me without stopping sometimes. The second isn't exactly enjoyable (quite painful really) until the very end, and the third is mostly torture until it either happens or you go mostly numb lol.