Cannot remove disconnected Linksys routers from Apple HomeKit

Hello, I recently installed Brilliant switches and a control panel for my lights in my basement. Unfortunately, I cannot get it to connect to Apple HomeKit. After doing some reading and talking with their technical support team, it seems like the problem is that I used to have Linksys Routers in my HomeKit setup years ago. They still show up in the HomeKit and I cannot remove them from HomeKit. They are not physically connected anymore and I no longer have them. Other than essentially redoing my HomeKit setup (which will be beyond painful), is there any other way to remove these routers from the system? Without doing so, I don't believe Brilliant's panels and switches can connect. Using Sonoma 14.3.1 on Mac mini (M1) and iOS 17.3.1 on iPhone 15 Pro Max.