This is an advertisement for an app that you don’t need and don’t want.
These sorts of advertisements and oft-related scams are ubiquitous.
For advertisers and for lazy writers, HACK and VIRUS can be wonderfully motivating terms. Best to be skeptical when you see those terms used.
Some background: Websites can not scan your iPhone. If any website could do that, the degree of storage access required would mean they’d just upload your passwords and all your data.
And another clue here: why would ‘Apple Security” be using that “dency” website and not Apple.com? And if Apple could detect that happening, they’d fix it in your iPhone, not require you to download some app.
And why would Apple do a countdown timer, or plead with you not to close the webpage?
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
And for completeness, sending email address can be faked, as can be calling telephone numbers.