If the parallax website is having content, pictures and good visual display page, then it’s OK. However, if the website is Infographic i.e. an image containing text, Google has not read it! There may be fewer SEO rankings. It can be sorted by converting image content into real content.
Therefore, the infinite scrolling function is a great technique for websites focused on achievement activities. For this, they need to find or find specific content. Although parallax scrolling in website design is widely used and it is a good job that leads to a faithful visitor scrolling, it can be less evaluated for SEO ranking.