It was an older flaw in Thunderbolt ports that could do this. Thunderbolt had the ability to request raw memory blocks over the DMA bus, which worked at the hardware level, completely bypassing the operating system. I believe this has since changed though.
That’s because the headline left out the very next sentence she said, “You’re next”
Combined, with the fact that it was recorded, it’s a very clear threat. The rest of the way it was handled is pure BS, but there is no denying that what she said was a threat.