You're right, but as one who thinks we've kinda optimized the fun out of the internet over the last years I can't really fault it for being suboptimal.
While I don't want all webpages to be like this, I like that this was made, rather than the developer thinking "this seems too much of a hassle to make efficiently, so I'm not going to do it".
It takes a good two minutes to show anything on a mobile phone.
Considering most of it could be done with CSS, I don't get what's the need for such a gigantic payload.
Moreover, I find it very hard to navigate. Not a fan.
While I don't want all webpages to be like this, I like that this was made, rather than the developer thinking "this seems too much of a hassle to make efficiently, so I'm not going to do it".