Is a step up but a small one
Sure the likes of Leeds, Leicester, Forest, Ipswich Derby wouldn't agree with that. It's a stepping stone for Gus ... keep Swansea in Prem for 2 years and job done ... that's when the big boys will come sniffing.
Realistically we've got to serve our time in Championship which is 5/6 years or something (unless we get lucky like Blackpool, Norwich, SCCC) ... and even then Gus doesn't do much better than a lower-mid table team
He's ambitious, no loyalty to Brighton and I don't blame him, he'll move on at first (upward) opportunity for sure