Virus warning screen

No, it is a scam.

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

I accidently clicked on this: https://discussions.apple.com/content/attachment/915097040

Am I fine after clicking on that? Or it's just how apple redirect people to the posted images?

Hi, if you're really not sure and want to allay your fears, get yourself a recognised anti-virus/malware checker.

I've been using ESET Cyber Security (see www.eset.com ) for a few years now with no issues whatsoever. I know there are very few viruses that can affect a MAC, and Apple squashes them very quickly, but I use it more so that my MAC doesn't become a virus carrier for the Windows boxes in my house or work.

You are fine. The link is just a method to open the included screenshot.