As a resident working part-time, these are moonlighting gigs I am talking about not a full-time position.
I don't know what area you are in, but I've never been or seen any place where the NPs make more than the physicians doing the same job (I say same job but rarely if ever are they doing the exact same thing, usually even if the responsibilities are the same the patient panels are quite different, with the higher acuity cases going to the MDs). You certainly wouldn't be paid more than me if I can prescribe suboxone and methadone, and all your credentialed to prescribe is naltrexone. In my state mid-levels cannot prescribe methadone (probably can't prescribe any schedule II but I would have to double-check that, in my resident outpatient primary care clinic, I have an NP who works next door and I think all the chronic opioid users automatically are scheduled with her supervising physician).
Residency training is more than 10,000 hours as well, which is more than 10x the amount that "doctorate" level nurse practitioners get (not that their 1,000 hours of training or schools is anywhere even remotely close to the same). That's another reason to consider medical school over either of the mid-level professions as just because a politician decides someone can practice without supervision doesn't mean it's safe.
With the exception of this gentlemen, I also haven't heard of NPs making this much money, so I would bet he is an extreme outlier. I do know that for hospitalists or primary care physicians making well over 400 grand in certain parts of the country, and psychiatrists doing the same. I would wager than $300,000 would place you close to the 99th percentile of all nurse practitioners, whereas that would be a pretty low salary for even just a family physician outside of the major cities. Rural PAs/NPs I could see doing pretty well, but from the data online 99% aren't coming close to $300,000 even if working in a dermatology or orthopedic surgery practice.