Because th-
Yeah, what they said. Just don't get the sense that they're particularly interested in (or need to make) any sort of EN outreach. They have gotten back to posting translated Puchisanji and other clips on their official EN subchannel at a regular pace though (mostly through contributions from the community):
Welcome to NIJISANJI’s official English YouTube channel made specially for fans of NIJISANJI all over the world. Find the best of your favourite NIJISANJI VT...
www.youtube.com
Although I don't think Cover really started their EN cultivation seriously until they took charge of the subreddit in April, but then the question is how did Hololive get so popular and attract more attention in the English fanbase compared to Nijisanji before then? Obviously nowadays the massive fanbase means that things like Korone memes can get a springboard to go viral extremely quickly, but what was driving it at the start of the year?