From the Article:
The October Suprise might not come from democrats. If Putin wanted to, he could employ a high atmosphere nuclear detonation, causing an EMP (Electro-Magnetic-Pulse). IT would send most of the US into darkness very quickly. IF he determines the US did in fact sabotage the Nordstream pipelines, this could be a very real possibility.
It would not be a ground strike, but the devastation and death would be all encompassing very quickly from lack of food, water, and basic necessities. The internal strife would be more devastating than a direct attack and leave the ground ripe for attack and subjugation. With China allied with Putin, nothing is off the table.
If Putin deployed this air burst above international waters, it would have very little effect on the surface, but the EMP would be devastating to over half of the US. IF they deployed two, one east and one west over international water 95% of the US would be in total darkness.