Poster HTML inside a web page

There's a type of web layout called Poster HTML, quite interesting for designers (not digital poster which is another thing for static advertising displays). They are usually very graphic, without anything typical of a website such as menus or buttons, with few or only one link that occupies the entire HTML and a scroll to see it completely.

This link peppasauce.love is a very clear and interesting example.

The drawback I see is that it's a single element reached through a link, an HTML mail, or a QR code.

I've been trying for a while to find a commercial way to offer this to some clients. I'm captivated by the idea and the possibilities in terms of design, but I cannot find a practical way to offer it. Like an advertisement within the client's website, something dynamic and immediate that can be seen without clicking anywhere or scanning a QR.

What comes to mind is a landing page on a website with a duration time, like a modal window with a delay, but instead of being a frame within a web page, it should be the entire page for a period of time. Once it has disappeared, a link can be placed on the web page itself to see it again.

Does this exist? Does it have a technical name? Any other idea or alternative?