That's not a good interpretation of Astral and uv.

uv is way more than a rewrite in Rust of Poetry or pip - it has a metric ton of smart design decisions that are independent of the language it was written in, both in terms of what it does and how it speeds things up under the hood.

https://nesbitt.io/2025/12/26/how-uv-got-so-fast.html is a useful review of some of the architectural tricks they came up with.