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So just going off of what I am somewhat familiar with - there's a thing with certain wifi frequencies where at times that band needs to be used for military radar, satellite, and other radar. This seems to be sometimes a result of opening up frequencies that were already being used, with the stipulation that the new devices should stop using the frequency and give way to the original use.
The way it works in wifi, is that any device using DFS channels has some form of radar detection, so it automatically changes wifi channels as soon as it detects it. It sounds like in order to make sure they comply as perfectly as possible, the radar detection leans towards being overly sensitive.
(I double checked my facts with this technical write-up on dfs and radar if you want further reading: https://www.cwnp.com/dynamic-frequency-selection/ )
So I would wager that it's not necessary the power of the radar taking out the drones, but the drones detecting the presence of radar and choosing to shut down based on regulatory requirements.
You could probably transmit a very weak radar signal and trigger / interfere with a lot of devices due to their sensitivity - but yeah that would be super illegal, and plenty of hobbyist ham radio operators with radio direction finding equipment would be eager to track you down. I used to live in an area close to radar so while my home wifi only had to switch channels once a month, making it very worth it to be the only person on those channels 99% of the time, my workplace had DFS events daily so they had to avoid those channels.