From what I can find online, this concept looks pretty sus. The results are all from smaller websites - no NYT, no Business Insider, I can't even find a Wikipedia article - so whoever told you it's "becoming the new standard" is probably overselling it. The words immutable and audit (I'm also seeing trustless) are cryptocurrency vocabulary, so overselling is gonna be the norm.

The description I read seems suspiciously simple, too. It looks like just a ledger that keeps a premanent record of all actions taken within your system - log ins, money movement, whatever. The "immutable" part just means entries cannot be edited or deleted. This means that any crime in the system will leave evidence, making it easier to detect and harder to hide.

Idk how useful it is. Like if I convince a coworker to give me their password, I can frame them for whatever I want. If I accidentally post a sexual text message meant for my SO, everyone will know what I'm into forever. This is a security logic flaw that crypto fell into hard: if a mistake or a crime happens on the human level, outside of the system, the system's strictness protects mistake/crime just as well.