No, they told Isis's lawyer explicitly that they'd run around him and do so by approaching Isis in public[1]. Doing that would require them to have some basic idea of Isis's movements and the willingness to wait to set up an ambush. Given that, it's not unreasonable to suspect they're attempting something shady and that Isis is quite smart not to simply "trust us." There is no reason to trust law enforcement that wants to sidestep entirely legal representation.

It's also clear you didn't read the article entirely before making a comment that now acts to distract and misinform.

[1]: https://blog.patternsinthevoid.net/fbi-harassment.html