Simple Bootstrap Templates

Does ThemeForest accept html templates similiar to this demo.

I found item in ThemeForest similiar to my items, demo.

Are design too simple or too generic? Will my templates get accepted?

Most likely you will get rejection as these templates can be found for free

It’s probably at least 3-4 year old item.

As @ki-themes said this style is not good enough anymore but also - it always looks odd when your demo has another authors details in it and as an exclusive author you cannot sell items here that are for sale (by anyone) elsewhere