Found the (Likely Unfinished) English Translation:
Hey, can I get a team with just the two of us?
Also confirmed it was supposed to be added in 1.4
Also confirmed his 1.6 ID was 1311 not his original 10xx ID meaning he actually got moved twice.
1.4 -> 1.6 -> Unknown
I spent some time today looking at old data and I found something for Screwllum, back when he was meant to be released, SW had a line for when she got added to the team with him:
嘿,这下你得陪我玩了,能不能把出战锁成两个人?
Which seems to have (kinda) been reused for SW999 😭