To decide if a computer is good for live streaming games, there are many variables you must consider, and some have almost nothing to do with the computer itself. For instance, your WiFi connection has a big role in live streaming. If your WiFi plan is too slow, your stream quality won't be as good. I recommend at least 40-60 megabits per second for a 720p 60 fps stream, and 70-80 for a 1080p 60 fps stream. Another variable to consider is what games you'll be streaming. If you're streaming let's say Fortnite for instance, the RTX 2070 (S) inside this computer will be far more than enough, but if you're streaming a game with heavier graphics, like GTA V, the stream might dip under 60 FPS from time to time.
If you do have problems with games with heavy graphics, I suggest turning down the visuals just a bit, until you're certain the game can run more than 60 FPS. Most streaming services only stream up to 1080p 60 FPS, so if your PC can run the games higher, you'll be perfect.
So to answer your question, if you have WiFi with a connection over 60 megabits per second, and you're playing games on the right settings, this computer is a perfect pick for live streaming games.