It literally got hacked, that's what the article is about. It is NOT unhackable.
It was unhackable while it mattered. It was hacked 5 years after it no longer mattered. And all but the effectively beta release remain unhacked even now.
To the community it was unhackable, until very recently. It's security measures held up so long that it appeared to be unshakable. There were no obvious flaws. In hindsight it was hackable, but keep in mind how long it took. This console has long been obsoleted.
Microsoft stopped manufacturing in 2020. It was not hacked in its lifetime.