Burisma is directly involved with the firing of the prosecutor, all the way down to them apologizing for spreading misinfo about him

That's not how I interpret that. From the OP:

"For instance, Burisma’s American legal representatives met with Ukrainian officials just days after Biden forced the firing of the country’s chief prosecutor and offered “an apology for dissemination of false information by U.S. representatives and public figures” about the Ukrainian prosecutors"

To me, this doesn't sound as if they're taking responsibility for anything themselves, and reads more like "we're sorry these other US people lied about you, please don't hold it against us."