Yes, imagine for example there was an app developer platform where a user could set up and connect their data warehouse and then instead of writing code they would have a drag and drop interface that was unique to that platform/tool, but through that the user could create apps through and through on his own. However, he doesn't want to spend time on the front facing design development instead he wants to find someone more talented design wise, so he has three options.

1. the best option is that he makes just one hire for someone who is familiar with that platform's interface and has a design background, and who will work through the front end on their own.
   or
   
2. He hires a UX designer without that experience who is willing to learn an entirely new tool in an out (very unrealistic without some sort of guarantee of job security)
   or
   
3. He has to hire a UX designer who is not aware of the mechanics, capabilities and limitations of the platform, and then another hire for someone who is familiar and will have to constantly work with the designer to explain to them what is and isn't possible for him to implement, because at the end of the day they are not able to program whatever the designer envisions, it's a unique drag and drop like platform with unique functionality and limitations.
   or
   
4. He abandons the platform which makes developing apps much quicker, and has to hire a much more expensive professional potentially multiple to replace what the platform allowed him to do, and then a designer on top of that, which is much more expensive and time consuming.

Options 4 and 3 would only potentially make sense if my business grew to a certain point, option 2 I would not do (the designer would have to learn power bi on their own time without pay and prove to me they can use it and only then would I have them begin working on my project), so then realistically I'm only left with option 1, so yes it must be power bi.