Yeah, we've seen the comics, but this is different. It's not like everyone who died in the MCU returned. And Gambit's death here has a very specific context. It's different. Also, we don't fully know what their plans are. The original show has never been this dark or dramatic. They're taking a drastically different approach here. And if they have a 3 season plan, for instance (which I doubt), I could see him remaining dead. And/or, if their plan is to keep showcasing new mutants every season as part of this rebranding and reintroduction of the X-Men, I can also see Gambit having an emotional heroic sendoff to give room to someone like Kurt, Colossus, Betsy, Kitty, Bobby, Alex, Rachel and many others...
Yeah, I've seen the comics and won't be mad at all seeing him returning. But I feel they cannot do it unceremoniously. There should be some consequences (like Gamora in the MCU).