I've never heard of those, but I looked it up on youtube and those clips looked quite abstract and stiff to me.
I implore you to still watch the film. It is the oldest surviving full-length animated film (older animated films have been lost to time) - so if it looks 'stiff', I guess you can blame 1926. (yes, this film was made 11 years before Snow White) It was directed by a woman, which is progressive even today...
Now - one thing that annoys me not only about this forum but about the internet as a whole is the ethnocentrism regarding animation. All this very absolute discussion about styles "never done before" - there are so many countries & animators that have produced so many shorts & features I'd be hard pressed to discover a new style. You just haven't heard/seen of it. Not that I have, either. But there is some fascinating experimental stuff out there that does not look like Disney. Too many of you (and me too once, but not as much now...) think Disney is a pantheon of animation. But in reality, they represent just one visual style and a very cartoony one at that. Dozens of respected animators have publicly denounced the Disney style/formula for being too conservative and simple. Disney will never do anything truly avant garde or experimental unless it is guaranteed to return a profit. They are a multinational entertainment corporation, not a private/independent arthouse studio.
In terms of what you're talking about, here are a few examples that popped into my head.
1. "Heroic Times" - this 1983 Hungarian film was created by oil painting. Each frame was a brand new painting - creating a truly 'moving painting' look.
<iframe width="420" height="315" src="http://www.youtube.com/embed/nWPq51-L7cw" frameborder="0"></iframe>
2. "Old Man & the Sea" - 1999 featurette - painted directly on glass cells, inspired by the romantic realist art movement.
<iframe width="420" height="315" src="http://www.youtube.com/embed/v1EbNvHDxbA" frameborder="0"></iframe>
3. "Iblard Time" - a featurette by Studio Ghibli. Takes the fantasy paintings of Naohisa Inoue and digitizes them so certain elements move. No real good videos online, but a screen:
4. This video shows animators who take a 17th century painting, deconstruct it and re-build it digitally so that it breathes in 3-dimensional space.
<iframe width="560" height="315" src="http://www.youtube.com/embed/mWkBlmuSNb8" frameborder="0"></iframe>
5. "Gwen, The Book of Sand" - 1985 film that uses limited/cut out animation.
<iframe width="420" height="315" src="http://www.youtube.com/embed/fieXqvYL4pQ" frameborder="0"></iframe>
... that's just a few examples I can think of right now. All of these represent 'painterly' animation - not flat, cel-shaded, cartoon style that the majority of the Disney canon have been animated in.
I hope this is similar to what you were looking for.