As stated in the article, this restriction was already rescinded (to avoid a lawsuit reaching court) and replaced with an advisory stating that drones near DHS vehicles might be taken down:

https://www.rcfp.org/wp-content/uploads/2026/04/FAA-drone-ad...

The effort from the EFF is to get the original restriction called back up and vacated - essentially, they want a post-hoc determination that it was illegal, but the restriction is already gone.