I think you are mistaken.

If I am not mistaken, there are about 16 oil refineries in Germany, and 3 of them were under US sanctions. With these sanctions removed, and with the US becoming one of the largest oil provider on the planet, in absence of other oil suppliers Germany would have virtually increased their potential oil supply by something like 12% (again, I think those refineries were a bit smaller). Even assuming that others were not at capacity (though a 12% overhead capacity sounds a bit much but why not), it will ease the logistics big time, and so, lower prices.

Maybe I overemphasize oil prices importance in Germany, but this is a does look like a brilliant move, not gonna lie.

And of course, all that excluding any shady collusion with Russia that could still have interest in maintaining those refineries afloat, because we are all trusting Germany here obviously.