I am not a big fan of TEPCO, but I think this is going too far. Underground cabling needs more time to be restored after a big earthquake. Laying them too takes more money and time because of the earthquake safety requirements. If 20 million tourists a year can enjoy Japan when there is no olympics, I don't think there is an issue with the cables during Olympics.
The current governor is very good at saying and proposing things that make people happy, but I am yet to see anything concrete that actually got done.