That take’s outdated. In the US/EU, routine antibiotics in fish farming are banned [1]. Growth hormones aren’t used in edible fish. Farmed salmon’s feed changed (more plant oils), but it still delivers high omega-3s and usually less mercury than wild [2].
[1] FDA “Approved Drugs for Use in Aquaculture” — https://www.fda.gov/media/80297/download
[2] Jensen et al., Nutrients 2020 — https://doi.org/10.3390/nu12123665