1) All three of these young men attended American colleges on full ride athletic scholarships. That in and of itself could be considered "worth" up to 150k in saved money. Worth noting though that if you had 20k saved, the savings would only be worth 20k in saved money.
2) I know none of these guys are THAT notable as celebrity figures, but a lot of track athletes do have brand partnerships with car companies and car dealerships. Jimmy Greissier is sponsored by Skoda, Michael Norman has a deal with Toyota. Presumably vehicles are included.
3) Remember that nothing about their lifestyle costs them money directly. Shoes, gyms, gear, supplements, travel, entries, lodging at altitude camps, etc. are all paid for. Given that this is essentially everything they need to do their job/live their lifestyle, they effectively pocket whatever they don't have to spend on rent and utilities at a house they share with several other athletes in the suburbs of Boulder.
4a) Yes, new cars are a stupid purchase. Nice new cars are dumber. Dumber still are nice new cars that have high fuel costs and require maintenance. With that said, as soon as I could afford one at age 27, I went and bought a lightly used M3 financed by a dealership. Have had it for 2.5 years and love the sh!t out of it, but there were definitely some concessions I had to make to get it (I live in Phoenix lol).
4b) With that said, Teslas aren't all bad. They have some issues because they aren't Hondas/Toyotas/Mazdas/Hyundais, but all electric vehicles are prone to way less bullsh!t. Also, the cost of "fueling" is negligible (especially when compared to a gas vehicle of the same year and size class)
I think the only issue I really have with this is the fact that pro runners make money very fleetingly. I ran for a D1 school and kept training seriously for a few years after (just do it to stay in shape and have fun at a family Turkey trot outing now), but beyond my scholarship (in theory) a bad race or two would've just been a personal disappointment, not something that put a car payment in jeopardy. When Matt Ramsden was hurt a couple years back, he said he lost profit that season. I'm sure he's done well all the other years, but that's Matt MF Ramsden. Sam Parsons isn't even that close to his consistency and level yet. I just hope that these purchases weren't made based on an idealistic projection of next season's development.