Oh, come on. The tweet links to a page that gives information that doesn't fit in 280 characters; making a sly reference to what people are talking about is hardly outrageous, and likely intended to increase distribution of the useful info in the link. https://www.fda.gov/consumers/consumer-updates/why-you-shoul...

The next tweet has a FAQ, too (https://twitter.com/US_FDA/status/1429050498515144708) that's quite clear that ivermectin has some uses in humans, but isn't approved or shown to be useful for COVID.

If you base your reality off single jokey tweets, that's on you.