paper submission - How to politely ask a co-author to remove his/her name from my manuscript?

Just found one of my very old written manuscript in my backup folder and interested to submit it to some journal.

I had written a Manuscript with 7 co-authors in 2008 just 10 years before. The entire work was dealt with observation datasets until 2008. Although I had conducted all the works independently and wrote the manuscript alone, but my supervisor had given 7 authors's name due to their little helps like suggestions to improve the manuscript, English check etc. However, I counts their contribution to some extent. But one of the co-author (say X) took 5 years to check the manuscript due to perhaps his busy schedule. So finally the manuscript was submitted to a journal in 2013. The reviewers appreciated the work and strongly recommended to update the results with recent datasets i.e. until 2013. It somehow irritated me because I had left the institute long before and was working in different field. Anyway, I updated the results until 2013 and modified the manuscript accordingly.

But all gone waste again, because the same X-author couldn't check the manuscript in the given time-line even within 1 year. So the editor rejected the manuscript. Now it is already 5 years, the same X-author could not send back his revision. I have also stopped sending reminders 2 years before (last reminded in April 2016). Probably I need to update the results again i.e. until 2018 now.

But I would like to remove this X-author's name from my manuscript first and then submit it as quick as possible. Now I am wondering proper sentences to ask the X-author to remove his/her name from our manuscript.