One page infinite scroll digital zine format

Site URL: https://canals-amsterdam.nl/

Hi forum, I'm not a web designer but was wondering if you all had any insight on how this particular site was made

https://canals-amsterdam.nl/

and if it's possible to do with Squarespace ?

Is it what web designers call Paralax Scrolling? 

and if so is there a comparable template or if it would need to be all custom ?

(I wouldn't need the clever animated transitions as I'm assuming that's custom code)

and if it needs to be all custom about how much would it be? like a grand?

It's so simple and beautifully designed. 

Basically I want to take the traditional zine format and split it in half for a mobile first friendly design that just is one page that scrolls infinitely for however many pages I add. 

Rough sketches attached -again I'm not a designer this is just an idea for a personal project and I thought the format would be cool for storytelling 

Appreciate your help

Thx

Ben