The repeated word/phrase in the code is experiment/experimentation.
Applying a vaccine to prevent the spread of a pandemic is not experimentation. It's a treatment.
Wikipedia;
"The Nuremberg Code (German: Nürnberger Kodex) is a set of research ethics principles for human experimentation created by the USA v Brandt court as one result of the Nuremberg trials at the end of the Second World War. In a review written on the 50th anniversary of the Brandt verdict, Katz writes that "a careful reading of the judgment suggests that" the authors wrote the Kodex "for the practice of human experimentation whenever it is being conducted.""
The vaccines haven't been tested long term. They are new, and involve never before deployed genetic programming which permanently reprograms our bodies to produce a substance it does not normally produce. How in the world is that not experimental?
It usually takes a long period of time to test drugs and vaccines:
https://www.ncbi.nlm.nih.gov/books/NBK24645/Drug Animal Testing:
"This stage of safety testing usually takes about 4 years. Drug companies test for mutagenicity (ability to cause genetic changes) and carcinogenicity (ability to cause cancer). The drugs are also tested to confirm that they do not cause infertility (inability to have children) or birth defects.
This stage of safety testing takes many years, because it may take a long period of time for animals to develop cancer or infertility as a result of a toxic drug."
It takes years for a reason.
The whole process of human drug testing typically takes a long time:
"Clinical testing is complex and time-consuming, averaging 14 years to complete Phase I through III testing to gain FDA approval."
Typical vaccine development:
https://www.historyofvaccines.org/content/articles/vaccine-development-testing-and-regulation"Vaccine development is a long, complex process, often lasting 10-15 years and involving a combination of public and private involvement."
So it takes 10 to 15 years normally. Why is that? Because they don't want to give people things which might cause adverse effects down the line.
Obviously if Nazi Germany was claiming that its experiments during WWII were "approved" and "fine", and "in our estimation it's safe" and "we tested it on some mice for a short time," that would still violate the Nuremberg Code when they forced it on people. The government's opinion is irrelevant. They are still experiments, no matter what the government claims.