This is most probably wrong. For example, nearly unique among vertebrates, bats constitutively express
IFN alpha genes, likely resulting in less viral replication, hence less GE.
https://www.pnas.org/doi/full/10.1073/pnas.1518240113
Here the last sentence of the article:
In summary, we present an evolutionarily unique bat type I IFN locus with the discovery of only three functional bat IFN-α genes. Although bats have fewer IFN-α family members, the constitutive and ubiquitous expression pattern of IFN-α in bats may provide bats with a highly effective system for controlling viral replication.