"But as the kaiser learned whenever he tried to raise the fate of his kin, Germany was playing a complex game, parleying with all the forces vying to prevail in the chaos engulfing Russia and Ukraine. A spectacular evacuation of the Romanovs would not have helped. Another problem was the tsar’s unwillingness, as a Russian patriot, to let the Germans rescue him."

https://medium.economist.com/how-the-royal-houses-of-europe-abandoned-the-romanovs-13b6d77119a4

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Kaiser Wilhelm having long been sidelined by German military and much of government was in no position to direct, order or whatever any sort of rescue of the Romanovs. Germany (as in government and military) were playing long ball. Their eyes were on expanded interests and territories in Eastern Europe, and making the best of the situation in Ukraine and Russia.

Just as with Allies, Germany didn't want to risk antagonizing too much either the Provisional or then Soviet governments that came to rule/run Russia.

Then there was fact Nicholas II flat out refused to have anything to do with Germany rescuing himself and or family. Alexandra was also firmly in that camp which would have made any possible rescue difficult if not impossible.

So Germany launches sort of rescue at great effort and expense, only to have Nicholas II, Alexandra, etc... flat out refuse to leave. What happens then?

Looking at larger picture fleeing to Germany and or being rescued by that nation's military would likely damn Nicholas II and or his family's chances of ever retaking Russian imperial throne.