As a former gymnast, I absolutely loved doing flyaway skills off bars. I thought they were so pretty and really worked with my coaches to learn the timing to be able to get the twist all the way around. 1990s gymnastics allowed for a lot more variety. What happened? Also, compulsories really should make a comeback. Some of these gymnasts have the sloppiest basics that it looks unsafe.
I take your point that no one does these skills at present, but does this really show change over time in within-code diversity? The examples you show - and they're magnificent and I love the video - range from the 1970s to the mid/late 2000s. Of course we'll see more diversity across that many codes than we do in 2024! They didn't do 2024 skills in 1988, either. Then again, that doesn't make the statement false. It's just that we need a sensible point of comparison.