I actually do think shrimp welfare brings us closer to a vegan world, yes.
In the status quo, people don't even know what ice slurry and eyestalk ablation are, and when you try to inform them while asking them to go vegan, they just take it as an attack against themselves and ignore you.
When you run corporate campaigns against retailers that source low-welfare shrimps — which SWP doesn't do directly, but enables other groups like Mercy for Animals to do while it plays Good Cop — you raise awareness and cast corporations rather than consumers as the actors at fault, which avoids a defensive reaction from most people.
If anything, we should expect people to feel *more* guilty and be *less* likely to eat shrimps after they learn about welfare reforms. This is what the research consistently shows when you tell people about welfare reforms in a laboratory setting and then ask their opinions about eating animals.