Many cultures, in the far east as well as Europe have similar "always be doing something productive" undertones.
I agree that the moralizing zealots that set the tone for early American culture were insufferable (and being so insufferable likely helped accelerate the settlement of the east coast states) but "muh protestant work ethic" isn't really unique to the US.
"Silicon Valley money wants to remake people in their images, they have a Protestant zealotry associated with their money that makes any oligarch look straight up sympathetic in comparison"
The comment literally suggests that Silicon Valley billionaires (which it juxtaposes with old money) have a Protestant fanaticism associated with their money.
It has everything to do with a moral perspective - that righteousness and wealth go hand in hand, and it does indeed come from the culture of the European Reform. It's not a matter of Christianity, it's mostly absent from Catholicism, and I suppose other strains.
Think of the meaning, the moral implications, of the phrase "the deserving poor". Try translating it into other languages, and see what happens.
I also think it's actually not that confusing, assuming you're experienced in reading English. It might be more subtle if you spend most of your time in other languages.
There is the root of your misunderstanding.
If you prefer the literal, think "Ayn Randian / Objectivist zealotry".
The Google founders, Sergey Brin and Larry Page, had Jewish backgrounds but consider themselves non-religious. Facebook founder Zuckerberg had Jewish background and considered himself atheist at some point. Microsoft founder Bill Gates is Catholic. Paul Allen had Jewish parents. Amazon founder Jeff Bezos was raised Catholic. Apple founder Steve Job's closest religious interest seems to have been Buddhism. Steve Wozniak describes himself as atheist.
So we don't find a single Protestant, certainly not a Protestant fundamentalist, among any of the founders of the 5 largest tech companies.