It’s a completely different technology. In fact, that research paper is so not about LSI (a.k.a. Latent Semantic Analysis) that it cites a 1999 LSI research paper ( [5] T. Hofmann.

Semantic Kernel Now Available In Python Flavor When Semantic Kernel debuted, it worked with C# projects only, though Python support was in preview. As of this week, that Python support has graduated ...