Does the Ryobi Scarifier remover buffalo grass runners?
Welcome to the Bunnings Workshop community. It's marvellous to have you join us, and thank you for sharing your question about the Ryobi Scarifier.
I suggest having a quick look at this discussion - Lawn renovation by @homeinmelbourne. There is a photo of the Ryobi Scarifier in action, it does a very good job of tilling the surface. It's also possible that it will pick up some of the grass runners, but it won't get them all. You'll still need to manually remove the remaining runners that the scarifier doesn't pick up.
would it be possible for you to post a photo of your lawn? This will allow our members to assess its condition. We'll the be able to make recommendations on how to proceed.
Here is a link to our best advice: What are your tips for keeping your lawn healthy?
Here is a handy step-by-step guide: How to take care of your lawn
If you have any other questions we can help with, please let us know.
Let me also extend a very warm welcome to the Bunnings Workshop community. It's great to have you join us and I trust you'll get loads of help and inspiration from our wonderful members. I also trust Eric's reply was useful. Did you need any assistance sharing some photos of your lawn? Please let me know if you need a hand - we're here to help.