Advice plz about inspection report "knob and tube"

[Amer Swid]

Hello,

So, the inspection report came back with multiple hazardous flags that needs to be addressed , but the most one that it is expensive (25k cost) is the" knob and tube issues "of the electrical stuff. Its old house (1900s). Does anyone has experience with this. is it something that i need to address right away if i purchase this rental property. The original offer was 300k but then we asked for 25k off since there are other multiple things needs to be address like old furnace and stuff like that, but we asked that they take care of the hazardous flags. Now they said ok to drop 25k and we cover for everything including the hazardous flags. Should I ask for another 25k off, or should I walk away. How serious is this. The knob and tubing is in the attic and basement.

Thank you

Here is the report