Parmandur
Book-Friend
I'm not so sure.
Disney definitely buried TBC the first time around. It didn't get a home video release until 1998, when the conventional "Disney Vault" timeline said it should have gotten one around 1992. It also got a 25th anniversary version in 2010, buts still no Blu-ray.
Disney+ has thrown the entire "Disney Vault" ideology upside down, and it remains to be seen what their long term plans are. The Vault has been a powerful tool for Disney to control the market, allowing them to strategically time re-releases to build their brand and take charge of revenue streams. It will be interesting to see how it plays out. If Disney did want to bury TBC, periodically releasing it on Disney+ would help keep the price of the DVD low in the used market (preventing if from becoming a sought after collectible) and let them avoid ever doing a Blu-ray release (or whatever next-gen hard copy exists).
It's not just in Disney+, it's in 4K on Disney+! And for Disney+, they are committed (where legally possible) to not cycle through content. So it's out there in high definition.