This is probably quite true.
Asserting that an elaborate full-scale Twitter hack is more probable than a single Twitter account (not protected by 2FA, from other comments), or a single machine hack, etc. is silly no matter how prolific of a HN user you are.
Statements like "There is no way that my account password was compromised without a much more elaborate hack of Twitter," are... questionable.
I'm not here to bash OP -- they may have been hacked or maybe Twitter was hacked, or something. But if this was me, or any non-prolific HN user, I'd have already been told to pound sand multiple times at this type of outrageous story with no evidence other than "my machines are secure".