Yes so I was under the same impression but then I thought 'Michael basically wasn't someone to change a winning concept and so probably wanted to continue making albums like the ones before: a little something for everyone/family entertainment/same personal themes. That's why I now doubt History is that unique:
'Scream': anti press, just like 'Why You Wanna Trip'/'Leave Me Alone' e.a., 'They Don't Care About Us': same, but more an anthem like 'Man In The Mirror'. 'Stranger In Moscow' could have been created as a result of the allegations but is still about loneliness in general and there are also more MJ sings around that theme (Scared of The Moon, Someone in the Dark, She's Out of my life e.a.). Earth Song is in the vein of 'We Are The World, Heal The World etc. So 'This Time Around' is probably about the allegations but in that case so subtle that it is still debatable imo and Biggie's lyrics make it more about backstabbers in general too.
'Money' may seem inspired by the allegations but doesn't mention it at all and throughout the song all kinds of greedy people are being named, making it even more of a generalized song. 'Come Together': I don't even know why that was on History in the first place, but it's definitely not about the allegations. 'History', the song, is a motivational track like 'Keep The Faith' e.a. 'You Are Not Alone': is just a love song, 'Tabloid Junkie' is about the press again; mainly rumours about his sexuality and general slander. 'Smile' is about overcoming sadness in general, The ad libs of '2Bad' make it sound like it was actually meant as a sequel to 'Bad' and lyrically I guess it's about general slander again. 'Little Susie' is about child neglection; also a very common MJ theme.
So 'Childhood' is him explaining his childlike behaviour. I agree that this one was probably written in response to the allegations, but it could also be written after opening about his childhood to Oprah and then mentioning his difficult past several other times after that (but before the allegations). Seeing it like that 'D.S.' would be the only track that is, without a reasonable doubt, about the allegations and would be out of place on any of his previous albums; making History pretty much a regular Michael Jackson studio album..?