Using multiple accounts AND pretending that you're not the same person - that's exactly what sockpuppeting means.

Some users have alts and don't hide them. That's fine.

Some users have alts, don't publicly disclose them, but also don't stoop as low as posting in the same thread with their multiple accounts or peddling same idiotic rants or bypassing ignore lists or otherwise abusing the privilege. That can be somewhat shitty but generally still fine.

Some users have alts, don't admit it even when caught, lie about it, use the alts to spam the same bullshit walls of text, "muh free speech", etc - that's you. That's the shittiest kind of a sockpuppeting asshole.