Yeppers. OSBot then connects to the Jagex RS Client. Stealth injection uses its own client, similar to how OSBuddy and Runelite are their own clients, and is more easily detected. By mirroring the original Jagex launcher you significantly reduce the ban rate at a cost of more CPU usage. You seem new, so you may also not know that holding shift + f2 will reduce fps from 50, to 20, and to 10 with each press. Do it once more to revert back to 50. And shift +4 reduces ms by 50 each press. I see people recommending a FPS of 20 (10 for very simple scripts like woodcutting) and a MS of 500 to lower CPU usage and increase the amount of bots you can run reliably. You will see these details in green letters in the top left corner of the OSbot client. It's something I wish I knew when I first got into botting.
Also, be careful not to use stealth injection during Runescape's update day which is always Thursday. Lately they have been detecting and locking accounts immediately upon log-in with stealth injections on Thursday. Mirror mode still safe for not getting auto-locked for me at least.
Edit: I said you seem new but your join date is like 2 years before me. Sorry for any insult xP