"actual 2D animation" being limited to pen/paper on animation cels is a narrow definition. Shows such as Primal are digitally animated using modern techniques, but it's still hand drawn rather than being fully puppeted like many other shows
Nowadays with hand drawn stuff you're mostly seeing keyframe work being done and the computer doing all of the heavy lifting with inbetweening with maybe some tweaking here and there by junior animators.
The tools are good enough now where it doesn't even look like shitty Flash animation anymore.
Also don't know what you're trying to show me with this 10 minute video. There's maybe 15 seconds of animation work being done this whole video? I see storyboarding and background painting and audio work but this shows shockingly little animation process...(and what I can see clearly is someone drawing keys...)
I'll admit, though, that while I know and have talked to some people in the animation industry it is not my area of expertise, so I could be completely off base with my observations.