I have updated the wiki [..]. However, the changes on wiki are not reflecting on robot page

The wiki and robots.ros.org do not share a common backend.

You'll want to submit a PR to ros-infrastructure/robots.ros.org instead.

See also the note at the top of the page on robots.ros.org:

This is a site to showcase robots using ROS. You can browse all, by tag or category as well as search. If there's a robot you want to see here please contribute via a pull request on github.