IT residence permit. After getting this you should anyway receive the work permit additionally? WTF?

Some of my developer acquaintances have obtained this type of residence permit. To get it, one must show a high income from entrepreneurial activity in the IT sector in Georgia, prove work experience, and provide references from clients confirming completed projects. In other words, the person has been working in this way for a long time and has received the new type of residence permit (IT).

So, do they still need to obtain an additional work permit? Why? It is formally already granted through this type of residence permit. The clients are not located in Georgia, and there are no Georgian employees. In other words, there is no integration into the Georgian labor market. So why would such people need a work permit?