[monoideism]

It also means “not equal to” in at least one common programming language: https://www.lua.org/pil/3.2.html

And usually, “approximately equal to” is expressed in this way: “n = ~3”.

Which is why I asked.

If that is what they meant, then I strongly disagree. A landing page is nowhere near a prototype. A landing page could be an advertisement for a prototype, but not a prototype.