They are right, the Fort Detrick virus was optimized at Chinese labs:
In this study, we confirmed the use of human ACE2 as receptor of two novel SARSr-CoVs by using chimeric viruses with the WIV1 backbone replaced with the S gene of the newly identified SARSr-CoVs.
https://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1006698
But why don't they tell us that the contract work was paid by the NIAID and USAID:
This work was jointly funded by [...] the National Institutes of Health (NIAID R01AI110964), the USAID Emerging Pandemic Threats (EPT) PREDICT program to PD and ZLS, [...]
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