I would guess/hope the GIFs are only for display in the README.md and the actual glyphs are vector-based like a regular font (so the 200x200px problem shouldn't be one)
And these GIFs are roughly the same sizes as the supposedly extracted glyphs at https://github.com/altmind/AAPL-last-resort-glyphs .
Nothing this detailed will fit into 32 by 32 , vector-based or no. There simply aren't enough pixels for the words and numbers on the borders. Also notice that the significanty smaller "last resort glyphs" at http://unicode.org/charts/lastresort.html are not the same as what is purportedly in this font.
NOTE: The sources and build scripts may be added after Unicode Version 14.0.0 has been released (2021), and as time and resources permit.
So this repo doesn't have the source currently, despite what it may say earlier in the readme. I'm assuming the TTF file in the release is the actual font, and the "Source code" zip is just an automatic archive of what's currently in the repository.