I started about 1 year ago to check RPCS3 updates almost daily and I haven't seen an update posted by kd-11 for a while. Even Nekotekina is absent, only with small updates lately.
You need to look better then... He just recently rewrote the whole FIFO mechanism in RPCS3, I don't know how you can miss a huge PR like that
https://github.com/RPCS3/rpcs3/pull/5315
There are also more details on this PR on Patreon posts