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The assertion was that they were never successfully tested in animals.
All the cats in trials 2005 and 2012 died when their immune systems over-heated as a result of 'vaccination.'
The mice trials proved that the mice became ill (infected lungs Sars-1). The rhesus macqaues were not known to be exposed to Covid-19 as no isolated samples exist and as they are relatively resistant (never become severely ill) to Sars-1.
The animal trials failed or were shams. No successful animal trials for mRNA 'vaccines' exist.
So the testing with rhesus macaques determined that the COVID-19 vaccines were not toxic prior to advancing to human trials. MISSION ACCOMPLISHED!