ZUNs account on Twitter (currently known as X) was hijacked and used to post dangerous links. ZUN still can't login into account. His attempts at contacting Twitter support wasn't successful, so he created second Twitter account, which later was suspended. In his new Bluesky account ZUN said that due to this Twitter situation he's considering making Bluesky account his main one. Later he added that he lost motivation working with Twitter.
I'm not sure where creation of second Twitter account is placed on timeline. Might be after considering Bluesky and before zun said that he lost motivation.