I would think that if the Court was going to Strike Down some part(s) of Deeming, then why not wait for them to do it? And Don't use Political capital on things you don't need to.
And what the Court Upholds, wouldn't that be what the Administration/Congress would want to Focus on if they so Choose?
Something like the 18+ Age requirement or Nicotine as a tobacco Product if it is Derived from tobacco I Don't see changing. But Hardware? And the entire PMTA Train Wreck? And the Predicate Date?
The legal action is completely separate from the legislative action. This isn't a situation where you can ask Congress not to act until a District Court rules. It's attached to an appropriations bill, which won't be held up for one small amendment to it.