enter_tain: Anthony is an archeologist. So he is looking at artifacts and formulating his hypothesis. Reich is a Geneticist and looks at the DNA and says not quite the case. Looking back through Reich's Who We are and How we got here, it is not uncommon for archeologist, linguist and anthropologist working with the data they have to formulate hypotheses that the DNA evidence do not support. Now I am not saying those other 3 fields are not important, but when there are ancient genomes from numerous different individuals, that provides clarity on which hypothesis is correct.
So I guess that Reich now has enough new ancient genomes to provide more clarity on the question of the PIE homeland. Now, Anthony saying it originated in EHG's might be partially true. It is just reading Reich, the population that PIE originated in could likely be from a population formed by admixture from EHG + other populations. So from a genetics perspective (which Reich is coming from), the population that PIE originated in can't be EHG's but rather a population with EHG admixture.
That is how research works. Theories are developed from the data that we have be it from linguist, archeologist, anthropologist, then hypotheses are formulated and then when ancient genomes are sequenced and tested, we can confirm which hypothesis is correct (reject ones not supported by genetic evidence).