Asbestos is not dangerous unless its already falling apart, or he starts cutting, drilling or removing it.
If the house is in a good state of repair there is no reason to do this…however I would not assume asbestos is removed, the average DIY’er would just strip it out without even considering the risk, the average tradesman would board over it or remove it with some basic precautions.
Some variants are fairly safe, i.e. a asbestos roofed garage would be dealt with by simply wetting down, and carefully removing and bagging the boards.
Fairly certain all the soffits on my house are asbestos, the garage roof was as well.