I don't really understand what you are trying to argue about by using the word "not legal".
Well... I did forget to add quote mark. Keep calm. I would define "archive something without humanly overwrite things that is not readonly materials" as "legal" (delete is treated as writing massive zeroes) a.k.a. clean. PRODINFO is readonly while savegames is not. And because you are already Tentcent feature flag active before your (customer) first boot so you have to remove (write zeroes to) some savegames, causing your "legal" (clean) status is just gone as a potential illegal log that will be sent via the telemetry service is generated.
The reason why I don't use the "clean" term is, writing some datas to known block of rw files is still clean IMO, your legal logs retains and your are mostly safe to go online with this kind of modification (like "legal Pokemons").
Plusmore, there's already a homebrew forked from the blawar incognito and modded by an user from the infamous 91wii forum, dedicated to region change the Horizon (Tencent feature to global feature and vise versa). The method behind the tool is the same but it terminates more system processes so more savegames can be deleted.
I have uploaded this to the Temp, source code is included.
https://gbatemp.net/threads/switch-region.569965/#post-9133316And I have been reserching on the region change method from 6th July around, a guy solves this first so I just gave up and turned to verify the "legality" of the method, and concluded illegal with help of my factory savegames.