Sounds like the last programmer has left your client in a bit of a pickle. Nim, while being a fantastic language, unfortunately doesn't have the fame and userbase that some other languages enjoy. Because of this you will have a hard time finding a large pool of Nim programmers to pick from. On the upside Nim is fairly easy to learn, especially if you have some relevant programming knowledge to draw from (personally I found that C and Python was a good starting point). Instead of looking for Nim programmers I would therefore advise your client to look for programmers willing or wanting to learn a new language. Of course not having any Nim programmers employed already to learn from might make this a bit trickier, but getting help from the live chat and forums if the documentation doesn't suffice will already help immensely. As a bonus he will likely end up with curious and flexible programmers which are the kind of people who will teach themselves new programming languages for fun. Of course if the situation is dire and he'd want to bring people up to speed faster it would be possible to post a job listing in the #jobs channel for a remote person to teach Nim and act as a mentor to the programmers he wants to employ. Or if he's able and willing he could even look for remote hires there as well.
The Nim programming language is, as you will hopefully soon see, a very productive language. The combination of a simple syntax paired with great performance and an almost unparalleled flexibility really makes it a gem. Finding developers will be harder than more mainstream languages, but hopefully these developers will have a great time and be very productive.
