No DLC, but I'll bet there's a Tears of the Kingdom Deluxe for the Switch's successor that has some extra content in it to justify charging you full price again.
Well, TotK is a DLC of BotK sold as a full prized game they can repeat it again, they have to recycle the map again add a couple of mechanics and done, a brand new game for the switch 2
Have you even played the game dude? I've 100% BotW and the ground level TotK map is most definitely NOT the same, add in the underground and sky components and it's most definitely NOT DLC. Saying it's BotW DLC is a huge red flag you haven't given the game a fair shake.