When I click the plugin filter and select more, I only see ~40 items in there.
Even the entire unfiltered list is less than 50 items and only one is labeled vanilla2.
So the 450 is from their own claim I guess, which must be unhosted plugins.
They also claim 300k people using it, which might actually be how many people have downloaded it, not using it, unless they have a “phone home” function.
They have a clean layout but their plugin structure is a bit confusing.