Here’s the issue with flamboyant statements like this:
Even if they can be true on one level (spiritually, we are commanded to give up our lives rather than commit relations with someone the Torah forbids us from having relations with) it can still be fundamentally untrue on another level (physically, thinking that it would be better for someone to go through Auschwitz than to intermarry).
When you mix up the two different planes, or when you meant it one way, but speak to an audience that hears it another way, this is not something that glorifies or magnifies Torah.
Imagine hearing someone murdered his neighbor, had relations with his wife after, then kissed his idol to thank him on his way out, and commenting “Ooof. I mean, could be worse. Could have been someone who regularly speaks lashon hara instead.”
Do our Sages say that Lashon Hara is worse than all three combined? Yes, of course. There are many explanations for why.
The important thing not to overlook here is that while they decreed you should give over your life for any of those three sins versus committing them (and how much more so all three!) they did not decree this against Lashon Hara.
So, context, nuances, and knowing your audience here.
And if someone feels like using Torah to “trigger” Jews in a provocative way? Serious introspection and study of the Halachot of Chilul Hashem are in order.
Intermarriage = as bad as holocaust and 10/7