What does "making a lot of money" equate to? Having a high standard of living? That's already present, in a society employing advanced automation and AI. You're approaching the issue under the misconception, that society won't be able to find people who will train to become medical professionals unless they're guaranteed to make "a lot of money". You're missing the point, that in a high-tech communist society, everyone already has a high standard of living, without markets or money.
There are many countries in the world where doctors, including surgeons, don't make that much money. They don't live in luxury and yet they're committed to their professions. Such people don't exist here in America?
The so-called "special goods" that I mentioned, can take the form of public and social recognition, being a member of the vanguard, when it comes to serving the nation and hence being considered a leader in the community. The benefits of membership in a guild, fraternity, or union, of medical professionals that offers its members opportunities to associate and socialize with others of their profession, who are at their intellectual level and education, sharing their passion for good medicine, providing healthcare to the country.
Access to medical conventions, and vacations that are exclusive for medical professionals. Access to working with the latest medical technology, access to "field-missions", where they travel to other countries to serve in disaster relief or some other mission. People dedicate their lives to professions that require an immense amount of sacrifice, without being paid much money. Our men and women in uniform, who serve in our military, get paid peanuts and yet risk their lives serving their country. This notion that you have that without capitalist markets there aren't any medical professionals is absurd.
Where is the evidence that "tens of millions" of Russians were killed by the red army? How many tens of millions of people did capitalist-run countries kill in their pursuit of controlling resources? Ever heard of colonialism and imperialism?
Death toll arguments won't help your critique of communism, because as a capitalist, you're standing on a mountain of dead rotting corpses. You have no moral high ground upon which to levy your charges or point your finger, at anyone.
For the sake of argument, let's assume communists killed tens of millions of people in Russia. Who determined that those people were innocent little lambs? Were they violent? Did they murder socialists? Did they burn down collective farms, sabotage farming equipment, and murder farmers? Did they join the capitalist, monarchist "white armies" and fight the socialists, alongside the American, British, and French invaders? Millions of people might die in a civil war, but that doesn't imply that everyone or even most people who die are innocent victims.
Nothing that you've said so far, justifies society embracing techno-feudalism or allowing the ruling capitalist elites to own all of the robots and factories, while America suffers mass unemployment and socioeconomic collapse. Do you actually believe you're going to remain wealthy like that?