He doesn’t cover much theology but remember Mormon history and theology is very closely tied. Covering things like the timeline of the so called Priesthood restoration - which is technically history - has a lot of impact on theology and the church’s claims as a whole.
Also, he has people like Sandra Tanner on who does not write the ‘faith promoting’ history that Packer wants.
Great quote btw - on of my favorite Packer talks.
Don’t know much about history...
Don’t know much biology...
https://www.lds.org/ensign/1993/07/a-treasured-testament?lang=eng