Ladskater, can you show a picture of Sawyer doing a Biellmann spin? I see several of him holding his free leg very high to the side, but none of him holding it up behind him.
Skaters were doing catchfoot positions in camel spins, in laybacks, and probably in other upright positions though I don't remember them specifically before Denise Biellmann did her overhead catchfoot spin, and many variations have continued to grow in popularity during the 1980s and 90s. We've also see catchfoot positions in spirals quite often over at least the last 15 years, but not so often (yet, though we may be getting there) directly overhead in an upright position (i.e., "Biellmann" position).
Let's not use the word "Biellmann" to refer to all catchfoot positions, because they're not all the same and it's useful to be able to distinguish them. We could probably use more words do distinguish the different positions.
Most, but not all, such positions would count as "difficult positions" for the purposes of COP levels.
At preliminary, prejuvenile, and juvenile levels, I often see attempts at Biellmann positions that would be considered very weak and even unsuccessful by senior standards, but then, the same is often true of basic sit or camel or layback spins by the same skaters. If the same skaters keep working on these positions the whole time they're coming up the ranks, by intermediate level, and certainly by novice and junior, there are often some quite lovely spins in all positions including Biellmanns.
When the novice and junior skaters who had not been focusing on spin positions throughout their careers decide to add more difficult positions specifically to get higher levels under the new system, they're not going to be as successful as their peers who had already been developing those positions for years. And so we see both good and not-so-good attempts at those levels. Same as with the edge-change spins that many skaters are just starting to work on now that it's specifically named as a feature for higher levels in the new system. Or back-to-front combo/change-foot spins, which ten years ago were popular only among the French team and rare elsewhere.
And I've even seen some pre-teen and young teen boys attempting Biellmanns, without full extension but maybe they'll get there if they keep working on it if they can maintain and improve their flexibility as they finish growing. Or maybe not, depending how their bodies develop. But I think we can attribute their attempting them, over the past several years, more to the fact that anything that adds difficulty or makes the skater stand out from the crowd would be considered a plus in the old system, and to the fact that Plyushenko had been doing them, than specifically to the new system that these boys are not yet affected by and might not even have read (or had their coaches read) two years ago or so when they first started trying the positions.