They probably still have it stored somewhere and not completely deleted. You might be able to email their support and ask if they can find it for you. If, y'know, it would take too long to just remake it.
I've had time to collect my thoughts on this more. Here are my main three concerns with the new site:
-No banner
-No scrolling
-Nav bar disappearing/reappearing
Obviously, scrolling has been addressed and will supposedly be available again soon. But the other two issues have yet to be addressed (from what I could see. Too many posts ;_;)
There are some benefits to the new site. I do like how the comic is centered on the page now. I also like that it hasn't been resized poorly and is the same as before (this was the main reason I left SJ after the update. They squished pages down into a really tiny width). I do like the options available ON the nav bar. I just hate the functionality of it.
Fourthly, but more minor, I really don't like all the extra clicking, like when I click an update in my notifications it should bring me TO THE UPDATE and the continue button shouldn't bring me to episodes I have already read. I also shouldn't have to click around to find a description of my comic. It should be right there for some to read and see what the comic is about. Especially since I have a content warning in my description and people can now easily miss it.
If all these things are fixed, then I think I would be satisfied with the new site.
I'm going to speak frank here again. This new layout was rolled out extremely prematurely and it's obvious from all the bugs and loss of features that it was rushed. From these things, plus the "I can't comment on why I can't roll it back", it really does not help anyone have faith in Tapas's future. There's some other deadline... someone else that this update was for. It was not for the users because there's no way they would have rolled out something riddled with so many bugs.
And if that is the case (where it was for the users), then I am extremely worried about the competency of Tapas staff. I'm sorry, but it's true.
Like when I worked at a job before, I wasn't supposed to write three exclamation marks in an email for fear the customer might interpret it as "yelling". But Tapas thinks it's okay to roll out a whole new, drastically different layout without fear of community lashback?
Sorry but I am simply not buying that. Unless if you're really stupid. I mean like... flat Earth level stupid.