So the "tcp: fix incorrect undo caused by DSACK of TLP retransmit" done five weeks ago for the Linux kernel didn't need to happen for the Rust implementation?
I don't think this commit has anything to do with wireguard. It's a fix of a bug in the kernel TCP stack, which wireguard doesn't use. (Beware, the wireguard-linux repo is a "fork" of the complete linux kernel)
And even if it did, a userland TUN implementation of the wireguard protocol probably doesn't have the same bugs as the linux kernel one.
Sure, the standard is relatively straightforward, but the implementations have to keep up with their environment. Wireguard in Linux has to keep up with changes in the kernel to a degree, for example.
