Ivermectin was studied and evaluated for efficacy against SARS-CoV2 using the same HEK293 fetal cell line as Regeneron.
One example study of many:
https://link.springer.com/article/10.1007/s43440-020-00195-y
Same with hydroxychloroquine vs SARS-CoV2.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7919379/
So even with older repurposed drugs, in vitro testing with HEK293 cells to evaluate efficacy against other pathogens and illnesses is almost universal.
“Tested on” is very different than “derived from”.
Hydroxychloroquine, aspirins, acetaminophen etc etc etc are older drugs that were discovered prior to the development of the HEK293 fetal cell line.
Therefore the existence of those drugs are not dependent upon aborted children
Ivermectin was isolated from avermectin, produced from Japanese soil in the early 1970s. Just because some what job wants to now test it on aborted fetal cell lines does not meant the drug itself is as tainted by abortion as drugs whose very existence would not be without aborted children.