The main difference, as I understand, is that national socialism is inherently racist and puts the (Aryan) race on top of the ideology, everything else must submit to the benefit of the (Aryan) race, whereas fascism puts the benefit of the state on top.
https://historyplex.com/difference-between-fascism-nazism
Trump, as far as I can judge from beyond the pond, is still claiming to put the state, or the United States of America, first, like a fascist would do. His hate speech against immigrants still serves the narrative of them being bad for the US, not of them being disadvantageous towards the benefit of the Aryan race.
AfaIk, Shelter is using the built in work profile of Android, as not every UI/ vendor has made it available to the users. (There is no visible button or option in the settings menu.)
E.g. Samsung smartphones have a “work mode”, but the last time I’ve used it (It may be different in current models), it only allowed for second accounts of selected apps like WhatsApp and hence, was a crippled implentation of the Android feature. My Android 11 Samsung tablet has complete multi user support, not only “work mode”.