I don't think they are claiming 40% of males today have y-haplogroups descended from the Yamnaya
r1b's population is only 190 million [1]
[1]https://www.razibkhan.com/p/the-haplogroup-is-dead-long-live...
r1b's population is only 190 million [1]
[1]https://www.razibkhan.com/p/the-haplogroup-is-dead-long-live...
> r1b's population is only 190 million [1]
Their population likely had multiple haplogroups. R1b was the most common (5000 years ago). But, yeah, the 50% number looks too high.