The linked article (and so AutoTL;DR) is not very accurate. If you’re interested in this incident, read the original post, which is short and compact. General media articles are only quoting or re-quoting this thread, typically with some misunderstanding.

Specifically (about this post): Among other things, multisig is only suggested; nothing has been decided yet.

Generally (in many similar articles): Probably a specific local machine was hacked, though no one really knows yet what happened. It’s unlikely that the Monero network itself was hacked.

Since I’m a Monero supporter, obviously I tend to say good things about it, but frankly, the ironical fact here is, Monero is so privacy-focused that when something like this happens, it’s difficult to identify the attacker—i.e. by design Monero also protects the identity of the attacker. Some Monero users are having this weird, paradoxical feeling: it would be nice if we could catch this evil attacker, but being able to catch the attacker would be in a way very bad news for Monero (if you know what I mean) 😕