I think it depends on pre-existing factors. Notably, that car has a 5.5qt sump for a 2L 4 cylinder engine, which is a slightly larger sump than average. Something like newer Mustangs having a 10qt sump, I could totally understand going 10K on an oil with, as they have double the oil capacity overall. A 1990s Honda or a Nissan with a 3.5qt sump probably wouldn't do as well with the oil just because there's less oil circulating. The car is also new, and he was the one servicing it with some of the best oil he could buy. On a used car with questionable maintenance history and possibly pre-existing sludge, not all of it will ever wash away, and you're going to have more sludge and junk in suspension every oil change for quite a long time.
He's also using $55 a jug oil, and his total oil change comes to probably about $70, whereas if I use Valvoline or Supertech my oil changes are in the mid $20 range all said and done. So I could do 3 oil changes for the price of one 10K one with said Ravenol oil. So 3x5000, 15K for the same price. Sure, it's more time under the car and dropping off used oil at Advance, but all of my vehicle fleet basically gets about 10-12K miles per vehicle, so it's twice a year for a 20-30 minutes under my car and dropping off oil before/after some other errand. I will freely state that I am broke and am not a CEO where "my time is more valuable than that!" where I could be using that combined hour or so of oil changes to work on a thesis, more than likely I'd probably spend it on a forum like this or playing video games.
I think if people are making an informed choice and using an appropriate oil with 10K oil changes that's great, but I still would not feel comfortable recommending a 10K oil change as a rule for the majority of people. You also need to understand if you tell people 10K, they may take it 15, etc. If you tell them 3, they'll do 5, tell them 5, they'll do 8, etc. I've always been a 3-5K person, but I've taken some oils to 6000-8000 before, and I think that doing that with 10K and taking it to 12-15K could be disastrous.