I think it's an attempt as a useless disclaimer that their Twitter hot takes are them talking as a private citizen and not as a representative of their employer.

Not that it will do anything to save you if you have the wrong opinions and politics in the mob rule cancel culture world of 2022.

Sort of like the useless "watch for falling ice" or "wet floor" signs at commercial buildings. They are trying to insulate themselves from liability, but IRL it just doesn't work that way.