I assume this is two statements: one without the parentheses, and one where each parenthesized word replaces the word before it. This is a compact, but borderline unreadable way to write two statements with the same structure. I hate it.

Edit: it makes a lot more sense in a live lecture, where the lecturer writes down the first sentence, then says aloud the second sentence while only replacing the necessary words on the board.

That’s exactly how my boss wrrtes his papers, lol