Daniel Negreanu, currently #2 on the all-time money list, actually had a net negative year in 2017 despite winning $2.8 million that year (https://www.cardschat.com/news/daniel-negreanu-loses-money-i...).
That said, I'm not sure the article is that misleading. Maria is 720th in the GPI rankings, which does account for buy-ins (http://pokerdb.thehendonmob.com/player.php?a=r&n=531869). For someone who began playing a year ago, that's a pretty remarkable achievement.
EDIT:
I should also note that "career earnings" or close variations are used in several sports, including golf and tennis. Take home pay is much lower than topline/headline numbers, but for obvious reasons it becomes tedious to ask people to calculate and publicize their living and travel expenses, etc.
I have never played jackpot tournaments. If I understand correctly it's you get a jackpot from winning several sit&go tournaments in a row. I don't know how the money there is divided.