Genetic research in this century has shown no link between the Khazars and modern-day Ashkenazi Jews.
“Scholars” doesn’t sound very credible.
Here is some evidence for the link between some of today’s populations and the Khazars.
“In Elhaik (2013), we tested the genetic diversity among European Jews in light of the two hypotheses: the Rhineland Hypothesis (the narrative) and the competing Khazarian Hypothesis. The results unambiguously support the Khazarian Hypothesis, portraying the European Jewish genome as a tapestry of ancient ancestries and high heterogeneity. This is the most popular paper published in GBE. It was ranked #1 most-read paper since its publication. This work was widely covered by the media (see Press).”