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And it works for me on both Firefox and Chromium, uBlock disabled. I can't find the function in the HTML either. Was it just removed?

Yes, looks like someone removed it. It's still in the source on the wayback machine cached copy:

That cached copy also seems to show the site was hacked for a while. Search the source for strings like "provigil free trial coupon".

Edit: It's still hacked. See https://www.google.com/search?q=site%3Asemiengineering.com+v... Clicking on any of the results takes you through a redirect to a shady pharma site.