Are Ashkenazi Jews really just "white european converts"

It was a major great power, in a three way tie with the other two great powers: Byzantines and Abbasids.

Jews, Ashkenazi, Sephardic, and Kurdish, are more closely related to each other than to their non-Jew neighbor populations.
ncbi.nlm.nih.gov/pmc/articles/PMC1274378/
ncbi.nlm.nih.gov/pmc/articles/PMC18733/
As for your Khazars, one errant outlier does not destroy a trend. In general, Jews do not experience mass conversions, and are, ultimately, descended from a seed population of displaced Israelites disseminated across greater Eurasia by the Romans.

Khazar Turks incorporated Germanics and Slavs, probably, yes. The entire empire converted to Judaism. It was the state religion and this would habe involved millions. The only major Jewish empire in world history.

Suddenly millions of Jews show up in the former Khazar domain. I wonder where they came from?

Jews today want to continue larping as Hebrews because of muh birthright to Israel.

These studies are basically measuring coherence within in-groups, not genetic origins.

What you practice as “Orthodox judaism” is only a 1-2 centuries old, and not an accurate description of historical judaism.

rabbianic judaism was conversion focused, you know nothing and just apply modern extrapolation to completely different eras

Yeah, because obviously every single person in an unstable empire with hands-off administration and no centralized bureaucracy converted to Judaism overnight, right? There's so much genetic evidence for this as well.

Khazars (Hazar => Caspar, Caspian Sea btw, aka Khazar Sea).

Were Tengri, then Jewish.

They were tolerant and allowed Muslims, Christians, and Tengrists to live among them.

Large scale Judaic conversion is attested, however. Turks (incl. Germanics and Slavs incorporated into Turkish clans and tribes) converted enmass to Judaism.

>He doesnt look ME at all

no he does, alot, its just that the famous black and white photos you see so much make him look more typical white european. Keep in mind that jews wouldn't have originally looked like your typical palestinian of today, stereotypical arab, or even typical levant arab, they would have looked more like southern europeans. Even today in the levant, its quite a sizeable minority of people who look southern european, or even as white as western, eastern or central europeans. It most common in those groups that did not convert to islam, and stay isolated from outside population.

Ashkenazi do have semitic blood, its a matter of fact actually because genetic studies shows this

They did have advanced administration and bureacracy.

See Bulgars converting enmass to Orthodox Christianity from Tengrism,

Or Hungarians converting enmass to Orthodox Christianity from Tengrism.

Or Rusyn Varangians converting enmass from Norse-Slavic polytheism to Orthodox Christianity.

Khazars were also not unstable. They were powerful and influential for a long period. They married off princeses to Byzantine Emperors ( see Empress Tzizek, aka Empress Çicek), managed mass trade along the Silk Road, established and built major cities, and engaged in succesful multiple front wars.