I'm not familiar with this particular guy, but it's a good example of why I try not to get my news from people who make faces into a camera on their thumbnail. "Every Linux?" When Ars broke the story, there were already security updates for 6.19, 6.18, 6.12, 6.6, 6.1, 5.15, and 5.10. 7.0 released two and a half weeks ago with no need for an update because this was already fixed. Fedora, Arch, and derivatives that update their kernels when their parent does were fine at the time that video went up.
I'm not suggesting CopyFail isn't serious and it's certainly widespread. For the broader, non-home user Linux community it's a MASSIVE issue. Distributions should update to mitigate it quickly, and home users comfortable with updating their own kernel should probably consider it. I acknowledge that the vast majority of distributions had not mitigated the issue yet. But MAN I hate blatant falsehood posted as hyperbole. (Edit: For clarity, I'm not rebuking you, Ponce de Leon; it's the YouTuber I'm venting about.)
For most home users this is almost certainly true, but it doesn't require physical access if someone has a means by which to get a script on a machine and execute it, and it'll break boundaries, so while I'd like to think most Linux users are savvy enough not to run something they were just sent, social engineering tricks may apply.