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It's both SecureBoot and UEFI.

He's probably preparing the thumbdrive the old-fashion way, jusr dd'ing the iso into it. You need a modern prep tool that's UEFI-compatible for it to boot on new hardware.

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Maybe I'm missing something, but (apart from Secure Boot) I used dd to create bootable Linux USBs and booted into UEFI just fine. At least on recent Ubuntu images.

Yes, I've done Linux installations on UEFI hardware using dd'ed iso images. What are these modern prep tools, and what could they possibly be doing that dd can't do?

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