Hopefully doing well.
Yes it is true. You can get the same look of Arcane Demo without knowledge of html. You only need to understand the basics of WordPress like, what are the posts or pages ?
As i described earlier, you have no need to do in CSS to resemble the Arcane Blogging Theme Demo.
Please share, what you want to do ?
Arcane has smart theme options to achieve your desired look without cluttering the code.
I will suggest to read Arcane Documentation to know how it works ?