I mention this because I saw his name mentioned in another thread on this
list.

It is a big problem in his material that he makes claims that the blood
agglutinizes and whatever. Except from what I have read, there is no
microscope slides, no evidence, nothing to show this agglutinization and
other stuff happening.

You blinked and missed it. Just take his word for it ok.

And really, it's not all that far removed from a form of dumb racism. So
and so make good this and that because they are so and so's. I.e. Thracians
were valued as night watchmen slaves in ancient times, not because they had
a wonderful ability to stay up late but simply because of say-so. Why not
take it one step further and say stuff about various physical
characteristics like hair, skin colour, etc.

Bring back phrenology! The shape of the skull tells all!