Ok. It appeared that 2.10 with glimmer 2 released, so it was quite easy to check.
Sample #6
Ember ver: 2.10
Description: Same as Sample #4 but using Ember 2.10
Time for rerendering ms: 20~25 
Commit: using ember 2.10 路 yarigpopov/js-repaint-perfs-ember@8e82c09 路 GitHub
Sample #7
Ember ver: 2.10
Description: Same as sample #5 but using Ember 2.10
Time for rerendering ms: 30~34
Thus, sample #6 shows basically the same performance as React (~50 FPS)
Here is the working demo:
Also, it has very similar implementation as react example (js-repaint-perfs/react/app.js at gh-pages 路 mathieuancelin/js-repaint-perfs 路 GitHub)
UPDATE: Created a PR for the benchmark repo Ember version updated from 1.10 to 2.10 by yarigpopov 路 Pull Request #97 路 mathieuancelin/js-repaint-perfs 路 GitHub