The enclosure appeared in a seemingly bizarre opening suggested by "Lizzie 0.6 loaded with LeelaZero v0.17 and converted ELF OpenGo v2 weights" in 2019, detailed by OGS 5d Mark5000 in the OGS forum thread '' ELF OpenGo weirdness.
That opening later received, in 2021, a Youtube review by EGF 3d Anton Christenson.
From a game between low-ranking Chinese pros. Black tried , making the 3443 enclosure. After the normal sequence to , you could say that Black benefits from the choice: compared with the enclosure at a, Black now has better aji here.
There are examples in pro play of the corner being enclosed in the 3443 pattern during the middle game, to leave the minimum aji. For example Sakata did this in a game 1979-04-18 against Ushinohama Satsuo.
This enclosure should perhaps be seen in those terms - a very tight way to take territory - despite tries to use it as an opening play.