"Category:Czech_Roots_Project" should not be used for people. The presence of these profiles there is most likely due to misunderstandings on the side of the profile managers.
Czech Roots itself suffers from some inconsistencies that, in my opinion, should first get sorted out before other changes are undertaken.
For one, there are literally thousands of profiles with the {{Czech Roots}} template, started when the intent was to highlight location. This has morphed into an ethnic label after Czech Roots was placed as subproject under Slavic Roots. With 1/3 of the population being German before 1945 of what is now the Czech Republic, with what sticker would one replace the template? The answer should be really good to justify the labor needed to change thousands of profiles, unless a bot can discern whether a particular profile is Czech or German.