I beg to disagree, 10kW at ~140khz is actually relatively straight forward with modern semiconductors and LiPo's. Eg. the inverters in a Tesla Plaid can do up-to 750kW, so I think two orders of magnitude more power is theoretically possible.

And then they left out that at such long wavelengths there are some unconventional antenna topologies available. Some of which are a lot more feasible than anything that was discussed in the talk.

The dismissal is quite concerning IMO.