Parsing in C# with dynamic data?

Question

C++ / C#

Good afternoon, I'm doing a study project based on C# parsing.
I ran into a problem that the site loads the data I need only after the script is executed (if anyone is interested in the sletat.ru site), and the site itself issues the start page code.
Can someone explain in detail how this can be easily bypassed? I've been struggling for several days, the deadlines are running out, but there is no progress