Both countries with socialized medicine and yet they still didn't come up with a cure. It happened in one of the most, if not the most, capitalistic tech-hubs in the world. Maybe there's just something about the private sector that gets things done.
This is misleading. The original post was about medical research, which neither in Greece nor in England is any more "socialized" than elsewhere. They might have national health services, but those buy their medicines from the same private actors as any hospital in the United States.
Also note that the original article is specifically not about profit-driven R&D but about a donation-funded, non-profit venture. The (hopeful!) success of such a venture does not really translate well into an argument for private, for-profit medicine R&D.
You could argue that it's the raw capitalistic drive of SV that is uniquely able to generate the wealth necessary for such non-profit ventures, ok, fine (there are also counter arguments to this), but this was not really the point of the original comment.
A lot of the big medical innovations still come from the private sector. The question is only whether we can get the interests aligned here.