I'll add some complete speculation on my part - if you read BU's press release when they announced Albie was gone, they do not mention he was terminated, relieved of his duties, or otherwise insinuate that the move was effective immediately. Instead, it says he will "not return next season" and he "will be replaced." Could this imply they are letting his contract expire? If so, it's possible HR will not let BU formally hire a new coach until that's done. I'd also imagine there's language in Albie's contract that would trigger some form of payment or risk breach of contract if BU separately named a head coach while Albie was still technically under contract.
I have no information on whether anything above is true, but would explain the complete silence. You have to think if they were actively interviewing multiple other candidates, especially those outside "the family" that somebody would've seen someone on campus or leaked something to the media. I had multiple friends tell me when they saw Rick Bennett on campus in 2018. Again, not impossible.