No it is not.
This was something that was done in the early days of Mobile devices, and before people figured out the best way to build responsive sites.
Nowadays we have all the tools to make sure content gets reorganized for an optimal presentation on mobile, and this is what should be done.
Displaying the site on mobile like the desktop and forcing the users to scroll horizontally is a bad idea, one that xtreme does not support 🙂
You need to explain to your customer that this would not project a very good image of his business.