Here’s what I found: much of the claim is supported by reporting so far, but some parts are unverified or overstated. I’ll break it down:

✅ What is supported by credible sources

• The shooter is Desmond Holly, age 16, from Evergreen High School near Denver. (People.com)

• He shot two students, both in critical condition, then died by suicide. (People.com)

• Authorities say he was “radicalized by some extremist network.” (People.com)

• His social media activity included references to previous mass shootings (including Columbine). (AP News)

• His online presence reportedly included neo-Nazi or white supremacist symbolism / antisemitic content. (AP News)

• He allegedly posted a photo of a revolver and ammunition about an hour before the shooting. (Axios)

⚠️ What is less certain or not (yet) verified

These are claims in the original message that are not yet clearly established, or where reporting is still incomplete:

• “He fetishized the Columbine shooters” — There's reporting that he referenced Columbine (e.g. reposting or mimicking appearance, or wearing similar T-shirt “WRATH”), but “fetishized” is a loaded word implying admiration or idolization, which might exaggerate what’s publicly confirmed. (The Colorado Sun)

• “White Mormon male from Utah” — I did not find credible evidence in current reports that he was Mormon or from Utah. Reports say he was a student at Evergreen High, Colorado. (People.com)

• “Republicans have been pushing the lie that the Kirk shooter was a transgender member…” — I did not find mainstream reporting confirming that claim about Republicans pushing that specific false narrative, nor that this is widely established. Could be part of commentary/political framing, but I didn't locate verifiable evidence in credible sources.

• Some of the more emotionally charged or generalized claims (e.g. “the Republican Party is the party of hate”, comparisons about “right-wing radicals are the real danger”) are interpretive or opinion, not strict reporting.

⚙️ Bottom line

Overall, the core claims — that Desmond Holly had extremist/white supremacist/antisemitic online activity, referencing mass shootings (especially Columbine), and was radicalized — are well supported. But some details in that statement are either unverified or exaggerated.

If you want, I can list exactly which claims are confirmed vs which are not, with live links. Do you want me to do that?