I am not sure what you mean by "nominally low." Interest rates are low because the Fed has driven them down. 0% is not possible, but they tried.
The Fed has authority only in a very narrow section of the financial markets. It often a highly leveraged section, but sometimes not. Also, it is the nature of levers to generate speed on recoil. For more than a decade, the Fed has used its leverage to drive interest rates down. If their grip ever slips, the recoil will do damage.
Nominal, in economics, refers to the literal number itself, regardless of its relationship to other numbers. For example, whereas a nominal interest rate might be say 4% in the mid 2000s, the real interest rate was closer to 2% due to the nominal rate relative to inflation. i.e. the real interest rate (r) = nominal interest rate (i) minus inflation (π

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In this case, rates (real and nominal) have been nominally very low in the past couple decades relative to the 20th century, but have been high relative to growth. My wording is careful.
What you're saying is that the rates are
artificially low. You can drop the point if you like but the reason I take issue is that phrases like those worm their way into peoples' heads and they make decisions based on them, without ever stopping to realize they have no idea what that means or where and
why they heard the expression.
Artificially low has a specific meaning in economics which is to say that relative to the market the rate is distorted. All "
the interest rate" interest rates are artificial since they are set by the Fed. Indeed the natural rate of interbank lending during deficit spending is about 0%, which means that interest rates during deficit spending are always artificially high, even nominally.
What you're metaphorically describing in your post is that the Fed is forcing interest rates down using some kind of tenuous power. But you're leaving it up to voodoo for how this works. There are no levers, there's no grip, there's no recoil. So these metaphors have to be describing an actual process to have any meaning.