does that mean the original accounts' block will be extended?

It can lead to that, yes. Staff generally only do that if a user uses multiple accounts, though.

Oh dang

Only asked because I had a homie on the Sonic Wiki who got gblocked for a month

Ban evading is never a good idea. If they're using an sock, you should tell them to stop and have them appeal their block instead support.fandom.com/hc/requests/new