"Fill catalog" cheat does not work as advertised, as far as I can tell. It doesn't touch stationery list, doesn't touch music list, and it also adds a handful bogus ??? items in several of the lists that shouldn't be there.
The video showcasing it (
here) shows it working perfectly, but I can't replicate this correct behavior with either the plugin or the online save editor, both of which being advertised in the comments by the video's uploader as working.
Both NLSE and ACSE exhibit this same behavior as well, so it's not like I have an alternative. The only thing I can think of is that, in the video, they're using the European version, and I'm using the US version. Either that, or something changed in the cheat that broke it by the time it was officially released.
I'm also using the original version updated to Welcome amiibo, and not the standalone Welcome amiibo version, I'm not sure if that could be causing issues with different memory mappings or something. but it sounds like they should be identical, for all intents and purposes.