most of these must be Chinese supplied consumer grade DJI's bought from AliExpress, unsurprisingly vulnerable to EW techniques.

I am not that sure. Take a look at the report itself (link in the article); seems like there is a lot going on which we don't know. What is clear is that this is the World's first non-trivial "Drone vs. Drone" War with important lessons for the future.

Related: https://eurasiantimes.com/better-than-patriots-russias-s-350...