It sucks that Zuck doesn't pay the taxes himself, and that Meta did it for him. But this is way less worse than the likely alternative of him not paying any taxes given it current political situation.
He is in fact going to pay the taxes himself, in the sense that they will come out of his net worth, not Meta's market cap. The significance of this deal is that it allows him to retain voting control of Meta after doing so, which might not otherwise have been possible. The current HN submission title is wildly misleading and I'm asking the moderators to change it (it's not from the original source).