The University of Maryland research group behind Geneva, which uses genetic algorithms to find ways around nation-state internet censorship.
Commenters cite it as evidence that automated methods can bypass the Great Firewall, including its filtering of SNI and ESNI, and link its papers.
The Great Firewall is bypassed by getoutline.com (self-hosted, open source), getlantern.io (once open source), and psiphon.ca (open source). There are also several other efforts that bundle multiple strategies like V2Ray.
See also: https://geneva.cs.umd.edu/
That's what domain fronting is for, and even though the GFW attempts to filter by SNI, genetic algorithms like Geneva are able to find workarounds: https://geneva.cs.umd.edu/papers/foci21.pdf
Some further explanation here: https://geneva.cs.umd.edu/posts/china-censors-esni/esni/
Looks like it's L4?