Cloudflare usually puts out good info but this is really bad marketing material stretched way too far to make a point, because they have their Workers platform and want to ride the "serverless" hype train.
Everything mentioned in that diagram is completely arbitrary and varies for every single vendor.
Serverless doesn't have a good definition because it's not a real concept.
At most lambda/workers/functions are really just PaaS, except instead of uploading all of your code, it's just a single file with a single endpoint.
If we really need a new term, then micro-paas or FaaS works fine, although most FaaS vendors are expanding to running any arbitrary container with multiple endpoints, so we're right back to normal (but modern) PaaS at the end.
