I do think he repeats some myths in the video, or at least confidently states some things that are not demonstrated to be true, but his core point of 'you still gotta check these things' seems pretty solid.
I am genuinely curious what the myths/unproven things he states - I watched the video and it's repetitive sure but not much felt controversial to me.
"the CVE assignment team is overly cautious and assign CVE numbers to any bugfix that they identify. This explains the seemingly large number of CVEs that are issued by the Linux kernel team."
Also as other replies said Linux kernel process is to assign CVE to everything - some of them may be just DDOSes, very hard to exploit and everything in between. All of them are bugs so they all get fixed and it's not a bad thing if distros ship those fixes and people update their kernel.