Short answer: Inaccessible
Long answer: Discord's API does not allows me to receive the Nitro-Status of a user. The requested user would have to authorize Discord.ID (Oauth2, like when you add a Bot) in order to get the information.
No. This is not supported by Discord and also against a core value of mine: Privacy.
No. Beiside some technical impossiblities, it's not what discord.id should be about.
No. This is technically not possible nor supported by Discord.