FYI, here is Cardinal Arinze on the subject. Not only here is African, but he was the head of the Congregation for Divine Worship at the times mentioned in your links
bing.com/videos/search?q=cardinal+arinze+liturgical+dance&FORM=VIRE1#view=detail&mid=5E807F90D786265FF4825E807F90D786265FF482
As a frequent visitor to the Church in Africa ( Tanzania) I will state two things.
The stoles were NOT African. The priests there wear what can best be described as ‘conservative’ stoles and chasubles. Standard liturgical colors with simple religious motifs are by far the most common. The One caveat being that quite a number of African countries have received permission to use blue as a liturgical color on Marian feasts. That is not the case in most Western countries.
Give that, the ones I saw in the video were red\gold, which is an acceptable liturgical color, and green with yellow\orange strips. I haven’t a clue on why the strips would be there, they carried no obvious religious significance, but then again, there is no actual liturgical requirement that the decoration on a stole actually have such a significance.
Also, the African choirs do very much sway and clap to keep time with the music. They consider that no more dancing than a Westerner would consider foot tapping to the beat to be dancing.
If you ask your average African if there is dancing in the Church, they will emphatically say there is not.
here is a good example from Tanzania (the Cathedral on Zanzibar). I have attended Mass at this Cathedral (twice) , not during this Mass though.
youtube.com/watch?v=u-xh4yNd-Ps
Finally, lay people do VERY much stay out of the sanctuary for Mass in Africa. Readers and altar boys are the only ones I have seen. And it is very much predominantly men as Readers and boys alone as altar servers.