The issue (i think) is that the animation is done post-rasterizing. So a translate of integer pixels is fine, but scale? Skew? Suddenly you have really visible colour fringing appearing out of nowhere.
The article is talking about "rerasterize the glyphs in their new location", which means it's rasterizing post animation. I think he's implying that there is something unstable with his each pixel is treated that breaks the illusion.
I wish they provided an example video of this since I can't visualize it. My natural thinking is subpixel antialiasing should look fine.
>the characters will jiggle as each glyph bounces around between different subpixel snappings and hints on each frame.
This shouldn't be a big issue unless your animation is slow and your subpixels are big.