I do see a mention in that post about instead supporting the jellyfin client developers. They give this page as a reference for who to support based on which client you use.

From a pragmatic standpoint, yeah it would accomplish that goal. However, that discounts the intended purpose of the stars, which is to represent an individuals attribution of personal value and trust. They lose significance and become misleading if you can buy them, which holds true even for good software. When we see a github star is should represent someone who has used the software, finds value in it or who respects and trusts the project.