they are admitting that their certification of machines is a joke
I think the Democrat Secretary of State's desire to generate a PR narrative and to create a reason to block any audits in the future caused her to forget that her claims did just what you said. If Arizona and Dominion can't run a simple test to identify if the code on the election machines is the same as what they had certified then they have never known what code was actually on the machines, and if it was even the same as the certified code.
In reality the tests do exist, and the Arizona Democrats are just lying, but taking their statements at face value they just admitted that the statements made to get the certifications had to be false.
Here is the AZ SOS's list of voting machines by county.
Here is one set of publicly available hashes for election system software.
Here is a list of federally certified voting systems. Detailed test reports are published which list the software and hardware components used in the systems.