Most of these signing statement scenarios relate to congressional arrogation of power that the courts have struck down when it gets to them.
Congress still passes such laws, but doesn't usually fight them in court any longer (lest they been thrown out). They just whine about it when the executive blows them off.
In this case... that's ok... because the administration is clearly in violation of the plain language of the law. Schiff can point fingers all day long and make them look like they're trying to hide something (which they likely are) and the administration will be seen as acting like the law doesn't apply to them (which it doesn't... but saying so won't look good).
On edit - oooh... even better. It looks like Schiff knows at least some of the substance of the whistleblowing. Some of it is leaking. Now Trump will have to get angry at an illegal leak that at least looks like Congress should have been given it. 
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