From whose site?
" Thus, we believe it would not be appropriate to specify when de-identified information can or cannot be used to meet legitimate law enforcement needs."
Who is we? It doesn't really matter though, because -pay attention now- this is not LE activity, it is a lawsuit challeging the law in question and Congress's right to create it.
" Those subpoenas can be completely challenged under the Federal laws
They can be challenged for all sorts of reasons. Any reason whatsoever in fact. In this case there is no valid justification to uphold any challenge whatsoever, because the suit the plaintiffs brought depends on the records the plaintiffs are holding and are deriving their claims from. Since the judge's are leftists, that make things up as they go along like the plaintiffs, a truthful, logical an just decision may not obtain. That's why it will go to the SCOTUS for a showdown.
"hoops to jump through"
In this case they are no more than puffs of bad breath from plaintiff's lawyers to deal with.