Biology literally doesn't work like that, these guys are doing this because they are bored and have nothing to do
I usually jerk off everyday, and some days I don't even end up doing that because I'm so caught up in a project, so I know without a doubt a guy who jerks off 5 times a day is doing nothing with his life, he has nothing distracting him from the silence of "waiting for the day to end", so all there is for him to do is jerk off
If you've fapped at least twice for the day you aren't going to start feeling horny randomly a few hours later, you have to literally go out of your way and say to yourself - "well I have nothing to do, might as well jerk off"
Not to mention the increased sensitivity to the glans of your penis makes it much less enjoyable, it literally hurts after a certain point
The sad part is, the orgasms you get are weaker and weaker, the first one is great (as always), the 2nd one is great but not as good as the first, the 3rd one and onwards is like "meh", you don't even ejaculate as much semen as you did in the first one (another reason why it doesn't feel as good), its a waste of time
I've jerked off 3 times a day once, its rare, and its a waste, because the orgasm doesn't feel as good
You might as well "save up" for the next day to actually enjoy it lol