Its likely that no notice is required at all for the SHNEC, so really the only issue is that some participants may have changed their elections for 1/1/26 to get the full match. I could see an argument that they should have a reasonable time to change it less if they want to, but I don't think that is a facts and circumstances argument against the SHNEC. They may defer more in the first pay period than they would have if they had not received a SHN with 4% match. From a compliance perspective, I think they are ok. They may have some upset employees/participants, though.