You've not actually addressed the cost points he makes. You seem to bediscounting the sheer cost effectiveness of renewable power because if an ideological opposition to it.

The wonderful thing about looking at how much something actually costs is you don't need to do all the work yourself - just look at the expense of the inputs and calculate your output. Solar panel electricity is absurdly cheap.

In any case it's obvious that current direct electrification is not feasible using current battery tech, so alternatives need to be explored. Unless we find a battery tech with 10x energy density batteries aren't likely to be viable in the air.