Very interesting since I lived in Budapest twice and learned Hungarian. I’m not surprised that Hungarians carry little trace of the genetic markers the Magyars originally had when they migrated into Central Europe 1100 years ago. There is not only the matter of them settling into an area nestled between much larger Slavic and Germanic populations and all the mixing that would normally occur over more than a thousand years. At least twice, the population of Hungary was severely depleted by wars and diseases and they invited people in to resettle the land. Those people were eventually absorbed into the population so that today while their distinct language has been preserved, they are ethnically not very distinguishable from the surrounding population.
When I first went there I was expecting a lot of brunettes. I was surprised by how many blondes there are in Hungary (and no its not all or even mostly hair dye).
Most of the Hungarians I know and work with are Slavic but with some non Slavic features like lower cheekbones.